The web has been quite unempathetic when it comes to DJs and the music culture that surrounds it. The key difference between mix DJs and other types of music is that the culture around mixing is made by and for DJ sets. The music makers want their music played by DJs on radio, in clubs, in livestreams, at house parties, that's why they made it in the first place. A blanket ban on music means even cooperative parties can't belong.
Same goes for platforms with automated copyright checking. Enough music makers get caught up in labels that don't get this either, that you'll almost always have three or four tracks striked out of your recording making it pointless to upload.
There has never been any money in live online DJing, it's done for fun and the love of it. So it just feels like petty fun policing.