This is the reason why sometimes I think introducing a strict regulatory body to control any form of token sale will be the best because any one at all just invest in a project by paying to exchanges and then they issue any amount of tokens and start selling to people. The worst thing is that sometimes, they do not even list an any better exchanges and investors realize that their monies are gone forever when the devs close down their site or stop giving announcement as at first.
Regulation is good to keep checks on projects and to also eliminate the scam projects. This is why some exchanges such as the tier one exchanges like Binance, Kucoin, Coinbene etc has taken upon themselves to run some checks on the project before they host the IEO on the exchange. Some of the checks include provision of the information about the team and proof of documents about the project. This helps to eliminate the scam projects to a certain good degree.