Probably not. If a phone number is replaced with a hash or a username, similar if not identical problems will emerge. Look at the numerous bitcoin scams.

I think the only thing that helps is time. The longer a technology has been around, the harder it is to fake. Fraudulent gold or currency is pretty tough to do and the people tasked with tracking down the offenders are effective. With most internet-based scams, the technology is emerging. It will take a long time for detection and mitigation to catch up.