Personally I host a private Invidious instance for my partner and I. We both use the iOS version of Yattee. It’s not great and there are quite a few bugs, both in Invidious and Yattee, but it works well enough for the occasional video. Invidious doesn’t support ads and Yattee has build-in SponserBlock, which works well.

That’s sadly where it’s at. I’ve been lucky and managed to convince most of my friends to give Signal a go and in the end we stuck with it. But we’re all technically minded people so YMMV.