I use newpipe x sponsorblock on my phone. I have my subscriptions imported and I actually like that I can retain a feed without having to be signed into a google account.
For iPad I got safari with adguard and sponsorblock installed and airplay that to the TV. Does Roku support airplay? So now I get not only blocked ads but segments I want blocked like being asking to like, subscribe, intros, outros, recaps, and sponsored segments.
If you just want to watch youtube on the iPad just use a piped instance which has sponsorblock built in. !piped