I use freetube on desktop and grayjay on mobile.

Greyjay will also read from multiple sources, like patreon and nebula, and now including Bilibili, which is interesting to see content from. I think they have like a dozen sources that they are compatible with now.

Both have had constant access to YouTube for over a year now. YouTube likes kicking off those third parties..

Freetube will fall back to invidious instance(s) if YouTube fails to load. So even if YouTube is messing with them, you get something. You can turn that off if it gives you trouble.

It's a pain to manage my subscriptions across two different systems. But they both read and write to newpipe subscription streams, So I can export and import between them that way. Oh, and newpipe is another option for mobile. I've had problems with them, they tend to get blocked a lot. But I haven't used them recently, they might be better now.