You are right. In my subscription list, around 15 channels, there are a few channels who offer patreon subscriptions for 1-2 euros. In my opinion more channels should try to offer this. I don't think they get that much from ads/premium user view.
About NewPipe, which I've tried it in the past, I have to say it was a better app than Youtube's official app, and I'm not talking about the fact it was blocking ads. For example, three weeks ago, the new Youtube app upgraded to a new GUI, and all those filters in the subscriptions list (not watched, continue watching etc) disappeared or at least I can't find them anymore. It's like this new version is trying to make you not see old stuff or wants you to lose time scrolling instead of watching videos. I use very little the Youtube app because TV screen + browser with extensions (there are no ads blocked on Youtube on my PC) + KDE Connect offer a much better viewing experience.