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First of all, don't be a snitch. Mom doesn't need to know. I would just ask him if he knows what simping is and then explain why he is one and why he should stop. At a minimum tell him that in reality they are most definitely dudes trying to get his bitcoin by pretending to be attractive women.
There are a ton of scammers and impersonators out there, yes. And he should explain the various ways they use.