Grohl would never have done this early in their career, when he WASN’T a multi-millionaire.
It’s only AFTER they’re rich and have FU money, that their true colors come out.
As we’ve seen over and over and over...
You won’t see any up-and-coming ‘artists’ leave Spoitfiy. They haven’t gotten rich yet.
Here's the limiting factor: streaming music services like Spotify keep careful track of play statistics. 75% of the play action on Spotify is music that is >30 years old. Spotify primarily benefits the older musicians or their estates. So I rather doubt this particular boycott will snowball.