Best way to fight scams; don't out your money into it and view every project as a scam until proven otherwise. Bitcoin and a couple of altcoins has proven that over the years.
So you mean here after the project gets into an exchange?
First reason why ICO investors take high risk and invest in new projects is because they know they can earn more profit possible x100 or more, (Im talking about the past few years) but this year most of the projects even the best one didnt reach their target price of the coin after reaching the exchange.
But there still some people that are willing to take risk for a good project until now.