Eh, there’s a completely independent reimplementation of the server, so I’d be surprised if the same doesn’t happen for the apps if there’s a real issue that comes up

If you self host bitwarden/vaultwarden, each client stores an encrypted copy of the database, so even if your server was completely destroyed, you’d still have access to all the accounts you’re saving in it.

Yep, it does!

Do you remember what that extension is?

For android, I use https://revanced.app/

For desktop, I use https://freetubeapp.io/