Yeah, Shizuku opens up a massive attack surface through ADB. ADB can do a lot to your device without you even realizing it in a lot of cases, and you're basically giving ADB access to Shizuku itself and any apps that use it (which could be exploited) at all times, so its very risky. Its pretty dangerous and definitely best to avoid an app like this.
Skimmer
Brave is not spyware. That website you linked is horrible and full of misinformation. They also claim that Firefox, and even Tor Browser, are spyware. They act as if any and all connections a browser makes are automatically bad and used for spying/tracking.
I won't disagree with the other criticisms of Brave that you made, but just wanted to point that out. That website is just highly unreliable and makes verifiably false claims about the browsers it reviews.
What shell would you recommend? 🤔
There's so many I could list, I'll just mention 2 underrated ones I don't see mentioned as much:
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LibreTube - Best YouTube client imo, has a very nice and modern interface, proxies videos through Piped for maximum privacy (No direct connections to Google are made), No ads/tracking, SponsorBlock + Return YouTube Dislikes, support for downloading videos, etc. It's everything I'd want and more out of a YouTube client.
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URLCheck - Excellent app that allows you to preview what a URL is before you click it, includes tons of features such as scanning for malware, removing any tracking parameters, upgrading links from HTTP to HTTPS, etc. I can't recommend this app enough for the security, privacy, and general peace of mind it gives you.
Not sure how it hasn't been said yet, but I really like Helium314's OpenBoard fork. Can't recommend enough.