You think all those mixes come for free? They have to be licensed as well once the embedded song snippets exceed 30sec which most of them do (also depending on the local jurisdiction).
Soundcloud had to find agreements with the labels sooner or later anyway because of the mixes and just included the major label artists in the deal because why not. Otherwise they would have been sued (and they were sued by some)—again—because of the mixes.
> Well that's how music discovery works.
Ok, then let's agree on it's a matter of taste. But I'd like to revise my comment: 99% of the mixes on SoundCloud are cr*p. Maybe it's just my taste but I am also SoundCloud user from day one and somebody who spent tons of money on Beatport. If they can succeed with this music selection and find listeners like you and who pay, great for them, but obviously they can't. Btw, you find the 1% good mixes also on Spotify or Apple Music.