That is a fair point. Source first software isn’t a part of FLOSS, but even in worst case scenarios it still can be considered as “source available”. Which is better in term of transparency compared to closed source App. OP asked for “private” way to watch Youtube not open source way, so I think grayjay could still be a great choice. We are talking about watching from YouTube which is a corpo closed source spyware anyway.

Grayjay seems to be really stable compared to newpipe. I used it for 6 months now never break once. They also recently released a beta version for desktop which is quite promising

I personally think Freetube is the best for desktop right now. Recently, there is also grayjay for desktop. The UI is still buggy IMO, but also seem promising.

What you want is a feature that all Firefox based browser have. I am not sure about chromium based but ik that brave also have it.

I get that custom ROM is the best for degoogle my phone but as a Samsung user with a snapdragon chip I already run out of luck for it.

Thank for the suggestion I am currently using app manager to delete system software via adb I will test canta when I can

For Nvidia GPU, if u want squeeze the most out of it during gaming. I think there is 2 best options Bazzite(it is immutable so it will be really hard to break) or Nobara. Both of them is fedora base, so unfortunately your familiar with Debian based will not do much.