Try Grayjay. It’s free (though you can buy a license to support its development) and open source has fully viewable source code. You can login through the YouTube plugin’s settings and either stay logged in or import all your subscriptions and then logout to avoid any further Google tracking. It’s pretty stable compared to other FOSS YouTube apps and also has plugins for Twitch, Nebula and other video/audio content platforms. The YouTube plugin supports SponsorBlock and dislikes. Grayjay is being actively developed by the FUTO organisation, so is unlikely to randomly die like can sometimes happen with other FOSS projects.
Depending on how you use YouTube, the one significant downside may be the complete lack of support for Shorts. Not only can you not access Shorts from inside Grayjay, but if you open a Shorts link inside the application you cannot play it in full screen vertical. I am not a Shorts viewer (I used to disable it in ReVanced) but other FOSS apps like LibreTube support Shorts so this is one notable point of difference with Grayjay.