So I actually made a comment about this in the Steam thread. I hadn't ventured outside of the few channels that I normally watch, and was bored enough to flick through random streams when I saw several similar streams. At first I actually believed it, till I listened to the conversations a bit longer and it clicked.
In fairness to them, it does work, along with the streams of girls that put themselves on camera with literally part of their chin and the rest just chest. Viewers are watch and donating, the streamer earns the money and keeps the avenues through with they are "tormented" open and let it continue, such as the auto-voiced subs and messages.
In the end though, if that isn't your bag, don't watch it
There are some great female streamers on Twitch that don't do any of that crap. They don't have as many viewers but do an infinitely better job and provide an entertaining stream, so it's not all one sided, and for me at least, very easy to avoid the shit simply by looking at the thumbnail