Thanks to everyone for letting me know. It is indeed a clear violation of the BLF Rules to send advertisements via PM. When this happens, please contact me so I can close the spammer’s account.
Sometimes manufacturers contact me about requesting reviewers, and I sometimes give them permission to contact a few users of their selection via PM. In this case, Folomov did not request permission, and they sent PMs to a TON of users.
And this is the kicker. Folomov is now banned and added to the Hall of Shame.