An overarching question

You should probably discuss boundary setting with someone you trust. This situation might be only one part of a broader issue with your relationship with your parents, and you can probably make that relationship more beneficial and less detrimental.

Moving out

Once you are legally and financially able to, you could move out (or take action to improve your financial situation to make it more likely you'll be able to do so in the future). Distance can allow a relationship to change to your benefit. It seems that the majority of adults in the wealthiest countries don't live with their parents: http://static3.businessinsider.com/image/5908feb9fcd8eb1e008b4681-1200/young-adults-living-at-home.png https://64.media.tumblr.com/42facc68776260a335473a2553bb7f59/410ac9df6d9c28a0-9f/s1280x1920/8be58d13087dc686c9edcab713f63fc4c538e99a.jpg

The law

Note that, unless you have another reason to not want to be around your parents, I doubt that involving a state institution (like child protective services, a police department, a prosecutor's office) in your relationship with your parents will be helpful. Knowing relevant laws is more useful to better understand what is socially accepted behavior, and to be able to know what public institutions are available to help you if you find yourself in a situation where they're likely to be helpful.

Also, consider whether it's appropriate to tell other people you know about this situation. If you do choose to discuss this with other people, I would follow an escalation procedure so that information doesn't need to spread farther than necessary (for example, tell friends first, then if you don't see improvement tell adults that live near you, then if you don't see improvement tell adults in positions of responsibility (like teachers), and so on).

Privacy

You could inform your parents that state institutions might become involved if they cause you to be recorded while in your bedroom without your consent:

in many places, it is indeed illegal to put cameras in your child's room without their knowledge or consent.

property owners face some limitations when attempting to install cameras throughout a rental property. All cameras must be visible; hidden or spy cameras are not permissible in a tenant’s residence. Similarly, CCTV cameras are forbidden in bathrooms, bedrooms, toilets, and other private areas throughout a rented unit.

These quotes are discussing cameras, but I expect the same laws and principles apply to audio recordings.

If you receive mail to an address and are an adult, I expect you have rights similar to that of a tenant.

Money

It seems your parents cannot force you to buy anything, and surely not an amazon echo. They may have a right to receive money you gained as a compensation for services (as wages) during minority for some reason, but otherwise what is yours is yours, and your parents should only use what is yours in order to promote your interests (like your health, security, and so on), and probably they should only do that when it's necessary (in situations where there is a clear and urgent need).

You may want to ensure you have deposited any money you have acquired into a bank account you own (so there is a record of how long you had it, so it would be more questionable if they tried to claim it isn't yours). It might also be useful to use a separate bank account to receive and account for wages (since it seems there are special exceptions for wages, so keeping clear records of what money is wages and what is not might be useful), and it might be useful to have a UTMA custodial account (like one described at https://www.fidelity.com/learning-center/personal-finance/custodial-account-for-kids) (to enable making it even more clear what property has been transferred to you) (note that this does allow a custodian to use the property, but only for your benefit) (note you probably can't "transfer" money to yourself, so any money you already acquired should probably be managed without using a UTMA or UGMA account).

Don't. Break it. Pour water on it.

If you just need one for that, the cheapest Echo Dot model. If you care about a nice Bluetooth speaker aspect then get an Echo. If you wanted a screen for whatever reason then an Echo Show. But Echo Dot is the cheapest model. Oldest version you can get is fine.

Leaving the microphone muted should prevent packets from going to the cloud but I can't find definitive information either way. They process the wake word locally so answering to say "the device is muted" (if they do, mine don't, but I've heard some do) doesn't necessarily imply it's sending anything to the cloud.

Don't get one. If your parents want an intercom system, have an actual intercom system installed. No need to violate your privacy.

Jeff? Is that you, son? I told you that it was nonnegotiable, now get off the internets, I'm expecting an important telephone call and don't want you tying up the lines.

While there are a lot of good technical suggestions here, I've found that a conversation goes a long way. In my experience, when talking with loved ones, explain your emotions. Not "I hate this" or "the governments are listening!", but those core emotions. "Having a device in my room that is always monitoring me makes me feel anxious and I don't feel comfortable in a place where I should feel safe." Make sure that the dialog is calm and remains about your feelings until you know that you're being heard. If you aren't, try other phrases or examples.

Once you've established your feelings, address their concerns and feelings (active listening). It sounds stupid at first, but it works. "I hear that you are frustrated when I don't come down for dinner immediately." Finally, propose some solutions that meet everybody's needs and that the parties can select one to try out for a week and evaluate it's effectiveness, trying new things until a mutually beneficial solution is found.

Good luck. Please post the outcome!

Who is forcing you?

Get one with a hardware switch to mute the mic.

If you are OK opening things up and can use a soldering iron you could put a physical switch on the microphone.

Divorce

I mean I desoldered the microphones from my fire tv cube. It had 8 separate mics throughout but it works fine without them, kind of a pain in the ass to do though.

i haven’t needed one for years because i use their app on my phone and i can see their announcements as a notification and i can also kill off most of its tracking by DNS. unfortunately my parents don’t understand this

Sounds like you have a reasonable, compatible alternative on your phone already. Will they even notice if you continue using this and never plug the new alexa in?

You can't have privacy with that setup

Were I in that position, I would resist, just as much as if they were trying to put video cameras in my bathroom and bedroom.

I would suggest alternatives, and offer to research, order, and install them.

I would appeal to my parents' empathy, try to educate them on the risks these corporate-controlled hackable devices bring with them, and on the negative impact that surveillance has on human development. I would look for allies to help: siblings, extended family members, school authorities, counselors... anyone whose views they might respect, both alone and in groups. I would try to persuade them, and if it came down to it, I would fight.

If they stubbornly insisted, I would continue to bring it up regularly, both in private and in public. I would make sure that it was a constant drain on their time, and make sure they knew it was a constant source of resentment. I would escalate it to the point that they would have to justify it not only to themselves, but to the communities around us. I would consult social workers and government watchdog agencies for child/youth home environments, and find out from them whether my parents were breaking any relevant guidelines or laws.

And, if I somehow couldn't keep it out of my space or unpowered, I would open it up and disconnect the microphone, or perhaps wire a physical switch to allow connecting it only when needed. (By the way, reed switches exist that can be concealed within a device and activated from the outside with a magnet.) If I didn't know how to disassemble electronics or solder, then I would learn.

And then I would continue to fight.

If not using it for Alexa connectivity, why not just get an actual intercom? A pair is like 30 bucks on Amazon, no Internet required.

Or "hey Alexa, order an intercom system on my mom's account"

Isn't there an eavesdropping function on Alexa... Maybe it's actually less communication and more checking in on what you're doing (not to increase your paranoia)