f the information is online, it can be checked. There have already been many cases when fraud ICOs were exposed in this way.
If the team is presented for the first time, the project is new, then all you can check is what they provided. It does not give much confidence. Therefore, many projects attract famous personalities to the team. I think this often distorts the true image of a projects potential.
Presentation costs a lot of money. Famous persons costs money. Many crypto projects visit different conferencies, meetings. They becomes a sponsors of conferences and find investors offline. The team meet the people, speak with investors.