I doubt that these scammers get away with much, if any at all. Most people are smart enough not to be fooled by this trick. Occasionally when one does fall for it, the scammer gets banned quickly, and their alts (they often do have alt accounts) get banned too.
Just look at the threads where people claimed they got banned for nothing like this one: hey guys i got syuspended with 600$ dollars on my account
Little do they know that their activities are well tracked across all accounts they use.