The thing really is one needs to do a thorough research on these guys. Remember Karbon? very similar to plexcoin.
Karbon was promoted by one vitaly ovin. I should have Google searched him. anyways, I sent them my BTC and promptly they vanished from cyberspace. ICOs are a risky venture, but if you follow the team promoting the ICO, you will make an informed decision to invest or not. Do your research.