Are you asking who is reporting the plagiarism to the moderators? Or do you wish to know which moderator is actually banning forum members?

There appear to be multiple people reporting plagiarism, although suchmoon is very clearly one person running a bot to check for plagiarism and I would not trust her to not use her bot to check for plagiarism against her enemies (very broadly speaking).

I presume that Hilariousandco is at least involved in reviewing the reports and banning people. Many who have been banned are addressing their appeal threads to him, so I would reasonably conclude that he is sending a PM when a person is banned. I don’t think he is a well known enough of a moderator for this many people to address their appeal threads to him and so few/none to other moderators. He also has been able to produce the specific posts that have been reported when people are asking about their ban. I would be surprised if he is the only one working on this though.