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You might be right, I've never used ElyPrism and I didn't see anything about offline accounts without ely.by but I might've missed something or they just didn't include it in their README

PrismLauncher-Cracked lets you play without Ely.by as well, just pick a username and press play

1. If you want maximum privacy, Grayjay and Freetube don't link to accounts so Google doesn't know what you're doing (especially if you're on a VPN) but again, it's understandable if you don't feel that's worth it.

3. Ah got it, didn't realize you were using passkeys.

4. If you're willing to do a bit of setup, Stremio + RealDebrid ($40 a year) + Torrentio/AIOStreams is pretty much perfect to me (although if you watch a lot of super obscure shows maybe not the way to go as RealDebrid doesn't cache everything)

I've never used AdGuard but you can customize uBlock Origin to fit your needs and block specific things for specific websites. uBlock Origin is commonly used as a default in hardened browsers which would help you fit in with the crowd even more (although I realize you said you weren't going for anti-fingerprinting, just something to consider)

1. I switched to using Grayjay Desktop rather than my browser for YouTube

3. If you need a userscript manager, Violentmonkey is an open source alternative

4. Proton Pass has an app, yes less convenient without the autofill but better for privacy not to have the extension

6. Personally, I would just sail the seven seas

If you're really crazy about your privacy I'd recommend getting rid of any extensions you don't 100% need (keep ublock origin though) as not only can they stalk you themselves but it can also help websites fingerprint you. Keeping your extensions to a minimum will help you blend in with the crowd, especially if you use a hardened browser like LibreWolf and/or Mullvad Browser