Lets see: the korean exchange that just disappeared with investor money and oyster are just two off the top of my head that exit scammed with investor money.

Only invest with CEOS that are visable and vocal in a project. Off the top of my head: modernchain, hinounou, and linkchainx are where ceos are always in chat, always having public events (mfchain had a debate with mcscamfee and other project CEOS) and where they have a extensive business history. If you were to background check them, they would have a clean record.

You should never invest if there is any question about who someone is. Some of these scam projects just put random pics up as the CEO. you should do, at minimum, a huge google search on all project principles.