Yeah, I don't do streaming myself, but I've gotten into Vinesauce, and the community is reeling from this. Especially since Vinesauce streamers tend to play Big Label music either at the beginning or during their streams. (They see this as "free promotion" of bands, rather than some kind of unauthorized use, which is probably how it SHOULD be seen.)
But okay, I know Big Label music has been exercising the shit out of DMCA for a while, and it's no surprise to me that they're blocking that stuff. But the video game music? On a site that does mainly video game streaming? That just can't work. I'm positive that unless they figure this out better, Twitch's user base is going to collapse, whether immediately or over time as people get fed up with it. YouTube does do muting sometimes (seems to depend on who is the client), but most often a commercial song just gets an accreditation (This is "X" by "Y", buy it from "Z".) This seems like a much more sane solution. It directs the user to a place the interested party can purchase the music and is basically free advertising. Again, as it probably should be seen.
I did find it amusing that HitBox claimed they were having problems from a sudden influx of new users...