It's pretty random whether you get the message or not. Some of my friends, including me, straight up cannot watch youtube on their website half of the time anymore, because it full blocks us. It's not just an annoying message, videos actually just don't play. But I only get it on some days. I think the message only pops up if you've been watching for more than like an hour straight. Then again, some of my friends have never seen the message. Who knows. Just more weird big tech server bullshit. Like how twitter's api works 15% of the time (for me).

I'm daily using uBlock Origin (with Firefox) on Windows, and ReVanced on Android, and have experienced zero indications that Google is at war with ad blockers. These two are fucking fantastic and highly recommended. I don't expect it to last forever, but bravo to these devs and contributors.

A bit unrelated, but do you know if there is a hardened firefox for linux (just like Mull for Android)?

Firefox with Adblocker Ultimate working fine for me as of last night. I'll check again tonight.

Librewolf is one that might work for you