Oh there’s several ways, especially if you have poor opsec. People used to raid people’s twitch accounts and bring down their internet connections by looking for their username on Skype which had a vulnerability which they could use to find a person’s IP.
For swatters on the otherhand, they tend to either know the streamer themselves or they tend to be groups like KiwiFarms who are a lot more organised and do a lot of research and detective work, like looking at the video, looking for usernames elsewhere, looking for emails, and looking for location clues. It’s really fucked up. They found Keffels’s Motel by the sheets in her room. It’s bad enough if you do not think about these things and just have sloppy OpSec, but even if you do, they can still find you.
Next stop, we will make installing Linux on a Dead badger a reality.