Twitch has a large number of sex workers who are just using it as a conduit to find "customers" and are not contributing to the community, but detracting from it. There are other sites dedicated to that.
This is especially problematic for female streamers who are community members and get constantly harassed with "tits or gtfo" or worse. They struggle to be taken seriously as gamers due to the cheap antics and "accidental wardrobe malfunctions" employed by the other women on the site, and are punished for it in terms of number of viewers.
Reiterating OP, the momentum of this thing looks more like -- whatever it was before -- it is becoming or has become an generalized attack on sex appeal in a realm where AO/R/18+-rated content is still frequently a kiss-of-death, if not something needlessly danced around. I get that some gamers may not want this kind of thing but, c'mon, let people be people. If it's really bothersome then leave the site and maybe management will make a change after enough follow suit. It's already buried in a ghetto of other banners under "Browse" and I didn't see and there doesn't seem to be any other way to get to it besides search.
Also the twitch community should really evaluate it's complaints about outsiders given that it exists in the husk of justin.tv's corpse.