Cercube which is basically equivalent to youtube vanced on android (no ads, background play, downloads etc) - its not on altstore (nothing really is) but you can use altstore to sideload it
I wonder if you could "abuse" a service like GH Actions to replace an always-on Mac. I'm not an Apple user, so I don't know how feasible it is.
But using such a (freely provided) service for something it wasn't meant to do is unethical, even tho I think it's a lot less unethical than mining crypto on it.
If you have an always-on Mac to handle updates and refreshes, it’s been a near-seamless experience for me for over a year.