It’s revenge, possibly more damage control and definitely intimidation. He posted screenshots of the G5: Chatter of Ponies mods and admins banning him for faving and creating foalcon here on Derpi and he dumped the initial name list of mods who were in the PCL server that’s in the OP onto 4chan. Now the mods from Manechat retaliate, blame him for the doxxing of DataByte and DaringShepard (and possibly mods from the G5 server are being doxxed too now? didn’t see anything on 4chan and the mlpol thread has nothing, but possible) and ban him with the BS claim that he enabled the doxxing:
They don’t like the truth about them being out in the open and that everyone sees their schemes now. So they ban the person who brought forth the first names, in the hopes that everyone else who has info or screens will be intimidated and scared and don’t dare to release anything out of fear to get banned too.
But they just dig themselves deeper that way. No better way to confirm how they conspired together by one involved server coming to the aid of the others. And by banning people for showing the truth of what they did, they’ll just make themselves more enemies.