Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ

While your claim is true---big budget movies, etc., need someone to pay for them---the unspoken corollary you're implying isn't true---that without the current economic model, no-one would pay for big budget productions, or that undermining the current model via piracy will reduce the rate at which they are funded.

The current model is: massive corporate copyright-holders can purchase the right the profit from an artistic production. They pay for its production up front. Even though we have a technology that can costlessly copy these products and very cheaply distribute them to almost everyone who wants them, the copyright holders maximise their profits by a) crippling this capacity by spend considerable money, labor and human expertise on technologies that artificially limit copying, and b) use state-supported coercion (e.g., fines, lawsuits, police, etc), to punish individuals who would circumvent these crippling technologies. To be clear, these copyright holders still make massive profits, vastly beyond what any individual they are persecuting for copyright infringement could ever dream of. Their policing of piracy is to make even greater profits.

Even though this is how big artistic productions are funded today, it is not true that in the absence of this economic model, big artistic productions would not be funded. The demand for these products would still exist, and if there's one thing our society excels at, it's directing capital to meet demand.

Alternative models that could fund big artistic productions:

• a centralised fund we all contribute to in proportion to our means (e.g., progressive taxation), that pays artists in proportion to how much their product is consumed (like the Spotify model, but publically administered, like TV licences)
• many small scale investors rather than corporate monoliths (like Kickstarter), whose investments are recouped by a) privileged access to get product and b) the still highly profitable cinema and dvd markets whose constraints (physical premises/media) are not compatible with free copying.
• a legislated solution that protects copyright until artists are sufficiently recompensed and then allows free distribution.

These are just some examples of the many possible alternative models for funding large art projects and deciding who should profit from them and how much. However the details aren't nearly as important (many different models could work), as the ultimate driver: whether our actions/systems/laws enhance or undermine demand for the art.

Piracy does undermine the current (corrupt, exploitative, reprehensible) economic model but it also increases demand for the media it distributes more widely and equitably. It doesn't, as you imply, reduce the likelihood of big budget media existing in the future, it increases the likelihood of it existing in a more fair and equitable way, that harness our ability to freely copy rather than crippling it for the benefit of the ultra-wealthy copyright-buyers.

I agree we probably wouldn't get any more Assassin's Creed or Deadpool and Wolverine. Very likely those kinds of media would die out in a world where no one pays for media. I have a hard time saying that's a bad thing. We'd instead have more weird little indie projects, which are so, so much better in every way. But sure, if you feel morally queasy about "stealing" (it's not stealing, it's copying) from giant corporations who make artistically bankrupt crap, I'm not going to convince you otherwise, and it would be a waste of my time to try and do so.

Maybe I should point out here that sometimes I do go out of my way to pay for media (especially games) when I don't have to. I bought Dwarf Fortress on Steam, even though the devs give it away for free and I donated to them a couple times before they released it on Steam. They are living off the money people pay for Dwarf Fortress and I'm so glad they're able to do so. I also bought my sister a copy of Pathologic 2 she has never (and probably will never) play because I bought my copy on sale and loved it and felt bad that I hadn't paid full price to a dev team that put their heart and soul into the game and had it sell abysmally for some reason. (Side note, play Pathologic 2, it's good!) I bought the Celeste soundtrack from Lena Raine's bandcamp because I love it so much, even though it's extremely easy to find and I've actually lost access to my bandcamp account.

I guess I'm saying there's nuance here and I like it when actual artists who make good art are paid. It's just that in our current society, buying a DVD or paying for Netflix or paying for Xbox gamepass or anything like that doesn't benefit the artists, the vast majority of any money you spend to acquire media goes straight to wealthy executives and I just don't see anything wrong with not giving them more money than they're already getting.