Really interesting read about the history of YouTube adblocking, how the new detection works, how uBO is responding, and how not to block the new popups.
You can create an account on a Piped instance and use it to sync your subscriptions and playlists. You can also log into your account when using LibreTube on Android. Invidious also allows for account creation, but I’m not aware of any mobile apps allowing to connect to it.