Define privacy?

Regardless, it seems like every other day one or other is broken - I just use whichever is working at any given moment.

Freetube app for desktop.

NewPipe on Android

Firefox+uBlockOrigin for Deskto/Laptop

SmartTube for TV

Since I only watch YouTube on desktop I use https://yewtu.be/ to search for content and redirector to redirect the requested video to https://www.youtube.com/embed/ or https://www.youtube-nocookie.com/embed/. And I use uBlock and Improve Youtube, of course.

Edit: I also use FreshRSS to manage subscriptions.

I use Invidious or if that doesn't work i split tunnel a terminal and use mpv

If you're only watching subscriptions and not scrolling the generated feeds, you could presumably run tubearchivist through a VPN and then watch via Jellyfin or Plex (there are plugins).

It will not only be private but it has sponsorblock.

They are all valid, but most front ends are broken by Google.

I use often Andisearch where i search the video and where I can watch it in the search result, sandboxed and through random proxy, also using the SMplayer on desktop, entering the video URL- Avoiding also that YT put any crap in my PC with the Portmaster