I run GNU/Linux on a Corebooted laptop. That’s my main device and the one I normally use to access Lemmy.
And FYI, I don’t run any proprietary app on my phone which runs a free software build of Android. Everything is installed from F-Droid.
It’s true that it runs proprietary firmware, but there’s currently no way around it. Unlike Grayjay, which is proprietary just because their greedy creators didn’t want people forking their app.
Fortunately, Invidious, Piped, Libretube and Newpipe all exist and work flawlessly so there’s no excuse to use proprietary trash like that.