Things that annoy me, but probably shouldn't:
I often like to share music, but have defaulted to using Youtube for it, since I won't touch Spotify with a ten-foot pole.
I won't however prevent others from preferring that, Tidal, Qobuz, Amazon, Apple, or any of the other myriad of streaming services available.
For music (and for that matter video streaming), we need a URI scheme run by an authority, so I can simply link to music://some-identifier and be guaranteed to meet what I intended