For Youtube, I gave up on Invidious and Piped, they have too many issues, very unstable.
I use YTDLnis now to fetch new videos once a day and automatically download them to a folder—this way i don't have to deal with any frontend whatsoever, and i OWN the file if for some reason the creator or Youtube takes the video down.
That Noflux RSS reader seems to be for desktops, i'm mobile-only.