People have been dox'ed before over smaller things than being a streamer. If you take a picture with your phone and post it to your facebook, I can just grab that picture and look at the metadata to see where the picture was taken. If you took the pic in your room, for example, I now know where your house lives.
Also, if you're a streamer and you're in an office like that guy from RoosterTeeth(?) people can probably look up where you work fairly easily.
Shit's fucked up yo, but staying anonymous on the internet is a privilige that only you yourself can protect (at least, as far as the general public is concerned, the NSA will still find you if they have a good reason to). It's why I didn't post pics when this thread turned into SelfieGAF. Heck, I don't even have pics on Facebook and I (almost) never give up my real age, even tho I'm old enough to look up adult content now.
People can't find out where you live if you're using a mic, tho. Unless you yell out where you live into the mic.