Sure, except for the part where scammers aren't banned--and they abound because of it. 

If I were to give a recommendation to OP's friend, it would be to stick around for a while and figure out who's trustworthy and who isn't--and that's not even that easy, even with the DT system.  Personally, it's only been experience with a small handful of members that's taught me who I can trust, and even then I don't trust anyone 100%.  And if I were OP's friend, I wouldn't expect complete security or the ability to trust anyone 100% either.