It's not fragmented like video is. You go to your favourite music streaming platform and listen. You don't need to check all 10 services you pay for to work out if the artist is available on it.
Probably, but there are other variables. Different sets of folks, and the fact that video consumption is not repeated as often.
We've seen a bit of progress recently—they stated in the news that Netflix won this round of the "streaming wars." Disney is thinking of allowing a some things back over there due to being heavily in the red.
Perhaps a sign that selfish-destructive behavior of the cartel has peaked.
It depends on what artists you listen to. Some artists have pulled out of certain streaming services: famously Neil Young left Spotify after some dispute.
There's also some unfortunate music which seems to be in licensing hell so it never ends up on streaming platforms, but I haven't noticed it with famous artists.
But yeah, for most music you're way less likely to have issues streaming their content.