It's a data leak that was posted publicly online. Yes DDoSSecrets restricts access to verified journalists and security researchers but if you don't fall under that criteria you can always just get it the old fashioned way by digging around for torrents of data leaks like everyone else has done since forever.
Isn't DDoSSecrets the only one that has access to the hacked/downloaded dataset, so there wouldn't be other copies floating around unless someone else simultaneously downloaded the dataset at the same time?
Someone can prove me wrong by dropping a magnet link. :)
