Libretube and some Piped frontends are currently down as Google is reportedly “rate limiting” (aka IP banning) these instances according to the Piped Matrix group. A workaround is being implemented, but if you are on Android and are in desperate need of Youtube audio during work like me Newpipe is still running.
there are pre-compiled apks, but they aren’t on the official repository, though you seem too lazy to download those aswell.