/mlp/ has a thread dedicated to promote altboorus, and it’s constantly being raided by trolls who keep trying to demonize the alts and shill Derpibooru and Furbooru as the only valid boorus to visit.
It’s evident they are from derpi because of the usual writing style, the same insults, same named images used to flood the thread and because of their obsession with trying to convince everyone that filing a DNP is a bad thing to do and how anyone who does that isn’t a “true fan”, etc.
When Luna was called out for using his normal account to shill Furbooru on Derpibooru, /mlp/ commented on that and the thread was immediately raided by outsiders who tried absolutely everything they could to get te thread deleted.
/mlp/ also had a thread about the importance of gatekeeping and it was also raided by the usual people who as usual, kept repeating the usual arguments, insults and writing style, and among their usual complains, they tried to convince everyone that just because someone uses the same insults, arguments, images and typing style isn’t fair to assume it’s always the same guy, and such.