Haven't people been streaming live sets using https://www.shoutcast.com/ etc for ages already? Is that illegal and was this supposed to be a legal alternative or something?

I remember running my own little icecast server with some PHP back in the day when MP3s were still new to allow me and my friends at university to stream my music like a jukebox. I think that was around 1998 or so.

https://jungletrain.net/ is still streaming to this day.