I gave up and got premium. It actually works out because we've cancelled Disney+ and Paramount+ and switched from the Spotify family plan to the Youtube Premium family plan and we're saving money, but I'm annoyed that I've resorted to this.

Do you need to be signed in to Youtube to get this?

I'm unable to watch any video despite uBlock instructions thing.

Revanced still works, not using it is just silly.

I had this too, only thing that worked was clearing cookies and site data of YouTube, then logging in again. Another browser on the same account with the same uBlock settings worked the whole time, so I guess it's "device" bound not account bound. Since the cookie purge I don't even get the AdBlock warnings anymore.

I just got blocked by YouTube on LibreWolf today but not Firefox. The ad blocking related extensions I have are uBlock Origin, Privacy Badger and Malwarebytes. After 15 minutes of resetting uBlock Origin settings, I've decided to try turning them off one by one, I found that it was Malwarebytes that triggered it. Even when I whitelisted Youtube but it didn't work, I have to disable the extension to fix it. It looks like it isn't YouTube don't want you using adblocks, it's YouTube don't want you to block scams and malwares.