Not sure if every audio file is upscaled, however I had a few files who clearly were 128kbs mp3 upscaled to ~192kbs opus !
personally I cannot hear any compression in the audio.
100% agree on that xD !! However, I’m some kind of strange audio freak hoarder. If the spectogram of an audio doesn’t reflect my standards (not upsacles audio files…) I won’t keep/archive it !
Do note that I didn’t used a paid YouTube account… Maybe they don’t serve HQ audio files to free users? Dunno, but after some digging into the spectograms I was not happy seeing how bad they looked !
It’s everyday the year of Linux !