One way to check is their profiles. If they are really dedicated to their project or they are capable of doing a success project. You have to also double check if there's already a bad reputation on the project like other users who were already scammed by them.
It is important that you check the team first who are doing the project because from there, you can assess if they have experience and they are capable of implementing the project. You should as well if the names match with the faces that were shown and if the team decides to be anonymous then it is already a red flag. Usually, I would prefer those team members that have a LinkedIn account because it would seem reliable than just showing their faces without any links.