I stopped using the YT app and just use the website with ublock origin enabled. Didnt see a YT ad in years.
Edit: typo
Edit: typo
PiHole allegedly helps with that, but afaik PiHole is only a DNS blacklister, and I already have blocked Google adservers troguh my router, tho that does not seem to help with ads in the YouTube mobile/tablet app.
[0] https://apps.apple.com/us/app/adguard-adblock-privacy/id1047...