I see nothing more than a rumor, as far as I'm aware none of my fellow members play DMM anymore as everyone stopped playing several weeks ago.
Runescape Community does not allow people to post accusations without also providing evidence, and Reddit has a rule against reporting players for wrong doing. There is good reason for that as in the real world you can get sued for defamation and harming a reputation can cost a business for example a lot of money for no good reason.
If people are struggling to change their IP addresses there was a guide posted in private forums quite a while ago that Speedy might be able to find if you ask him about it.