With Identity and address needing to be verified now, I don't think a ponzi will be easy to create. Sure it is still possible, but not as likely
ID does not matter to these guys. pirateat40 AKA Trendon Shavers is one of the most well know and identified members of the entire Bitcoin community.
This guy ran one of the largest Ponzis on BTC Jam (stole 190 BTC):
https://btcjam.com/users/394He provided ID, address and phone verification. He could have just as easily provided Facebook, etc. also. When he defaulted he had 19 x ten BTC active loans.
What would have made it harder for him would have been a limit the number of loans.