Most often, the organizers of the project use actors. They take pictures of different people and present them as employees. These people have nothing to do - they are a wrapper. There was an FTC project that abandoned its investors and disappeared. It turned out that no public person was a real employee of this company. This happens in many areas of activity and at the moment nothing can be done about it. People will cheat and even more so in cryptocurrency.
Worse part is that they were never caught until we realized they are gone. But there were also special cases though. I have seen projects where from the start they were branded as scam until the end of the ICO it wasn't proven and they listed the token which the price is way more than we expect. One project like ETHBits ($0.126919 USD (63.11%)) which still is active. Its platform isn't even used by anyone, not anyone I heard that someone used the exchange.