What is a scam and who decides it is a scam ?
Some scams are obvious but others are not. Once you start moderating scams it can quickly become extremely complex.
Some people call bitcoin a scam. Some people call bcash a scam - some people call it bitcoin cash.
Some people call Ripple a scam. Where do you draw the line ?
Cloud-mining contracts ? Short term mining contracts ? HYIP ? Pump and dump groups ? Crypto exchanges ? Tax collectors ?
The trust system - while not perfect - works fine in identifying and warning people of potential issues and scams.
The reality is that people need to educate themselves on how to spot scams, keep their crypto safe, use escrow and do their own research.