I was hosting an apartment server, allowing users to own a room and decorate it, when Ravencroft and Betelgeuse joined.
Knowing about betelgeuse's dramas, I was going to kick him / ban, but Ravencroft said he won't do anything.
So, I gave them a chance, gave them a room, and soon enough the server started to lag
I went to see what was happening, only to see betelgeuse spamming 1x1s everywhere inside of the room.
I disabled the duplicator, making it admin only, and the lag stopped.
They said it wasn't the duplicator, it was emitters or some stuff.
Then I enabled it, they duped a bunch more, lagging the server, I tried to ban them, but they left.
The next day (today) I looked in my saves to find this.
So apparently they both were spamming duplication
I didn't really trust betel, but I didn't expect Ravencroft to be doing this