I've heard about it in the past, but was yet to experience it myself.
People who ask for DMs to a server, delete their messages and then accuse you of DM advertising, claiming they'll report you. I don't know if they're lying or not, but it has me a little on edge. Is Discord able to go through all messages in cases of these somehow to prove innocence? Nothing's happened yet, but I'm not going to wait until something does.