Chess.com lets anyone come in and play if they have a valid email address. This is good, but it has a downside to it. This, of course, means that there will be some shady characters with bad intentions present here from time to time.
However, chess.com does its best - with your input - to weed such folk out as fast as it can find, verify and eliminate them. Chess.com does in fact rely on information from you to help get this done. So, if you have legitimate concerns about the behavior you see or suspicious aspects of some member accounts, report it to Support using the ticket process. It will be looked into.
some accounts are really dodgy if you ask me .