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...
LinkedIn isn't a reliable source to find details if someone is real or not, desperate scammers can create many fake LinkedIn accounts this year and start using next year or two to make people who are curious be satisfied, i would rather go with the popularity of the team, there must be some past companies or projects the team works for before creating their own project, this is the way