By the story, it wasn't the person who actually ran the exploit ("Kirk") who talked, it was other people in their Discord. Also, the hackers / social engineers in this OGUsers scene have a long history of talking / bragging to journalists. If you haven't heard ReplyAll's "The Snapchat Thief" on this scene, it is a great listen: https://gimletmedia.com/shows/reply-all/v4he6k