Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ

My guess is that with TV/Movies streaming you generally sit down to consume a given piece of content in chunks of minimum 1hr, and people rarely watch an episode of one show back to back with another show. So having that content fragmented between services doesn't provide much friction to normal viewing.

Contrast that with music, where having to switch services to listen to a different album would be extremely disruptive to the way most people listen. The only way that would work is if the separate services were generally clustered by genre, like radio. Having said that, I'm a little surprised that niche music streaming services haven't popped up (like how you have Crunchyroll for anime, for example).