I decided to take a better look at this and turns out the game makes their users pick Celestia’s side or Luna’s side and then award them with points after they make comments or upload stuff to the site. The more the users talk and upload stuff, the more points their side receives and as usual, some users are talking this game way too far and upload whatever they can get their hands on, just to score more points for their side.
According to some caps and comments I saw, Derpibooru’s staff is trying to rig this game to favor Celestia’s side and is delivering badly veiled threats to the users who call the staff on this.