As a personal vendetta against Jani Patokallio (a Finnish cybersecurity blogger) who was trying to unmask the person who ran the site - which goes back to 2023.
I don't really care about that though, because trying to dox someone and get them killed isn't a good or moral thing to do. You could easily just not do that. You have to really go out of your way to try and hunt someone down, and at any point you could just not do it. For the targeted person to want revenge is just an inevitability.