Believe it or not (which it wouldn’t be too much of a stretch to believe), but I used to operate my own e621.net clone. I didn’t have nearly the amount of experience needed to run an image booru, but I did. All I basically did was manually re-upload content from e621 onto the server that I was running on this sad little thing.
Lucky for me, the booru flopped (several times), but what happened to the domain? If I remember correctly, it first turned into a redirect link for some book being sold on Amazon. Now (at the time of this article’s writing), it’s a redirect link to a fake browser add-on that will steal your information.