Ads can be blocked on mobile devices with NewPipe[1], or Invidious[2], alternatively Firefox which supports uBlock[3] on Android.

[1]: https://newpipe.net/ [2]: https://invidious.io/ [3]: https://ublockorigin.com/

It's not, FireFox or ReVanced does the trick

Use Brave Browser. It blocks ads for YouTube. You can even lock the screen and it’ll still play in the background (iOS).