Getting a streamers address is easy if most streamers use popular voice communicating channels.
Post in their description where they're from or give away almost every bit of personal detail or have a follower of any sort added on social media.
Now I'm sure donating makes the streamer see your personal address also should they want to see it and in return could see yours.
I don't remember if that has changed ever since. Sadly having even the tiniest bit on info on your location social media sites or an open teamspeak/skype is easy enough to get stuff like that and should be avoided at all costs.