to prove they're not scammer project and minimize your investment of being scam...
1. look for the team if they're legit and real human... prove to yourself if they're human and real, not fake linkin from russia, reddit or facebook stuff...
2. list your find...
Actually nowadays scammers are using smarter stategy to scam people without revealing their identity. So it's difficult enough to find them out. But i know many projects were fail, where team members were real