[DrBoring]

I configured my kid's tablet to use AdGuard's public DNS https://adguard-dns.io/en/public-dns.html

No more in-app ads.

Strange thing, I tried it on my FireTV to block youtube ads, but it didn't work. I wouldn't be surprised if the FireTV monkies around with user settings. The other explanation could be that youtube uses the same hostname for videos and ads, so the DNS blocking can't distinguish.

I ended up side-loading a 3rd party YT client that doesn't play ads. https://smartyoutubetv.github.io/