There are so many coins now that there are always teams that are not serious about technology. They just want to collect a sum of money, how to judge this is not a trustworthy team?
First and foremost, check their whitepaper. Read about it and then assess whether what they are proposing is a great idea or not, and whether such a proposal could be translated into reality or not. If everything's pretty great, it does not mean that it is worth trusting already. Try to look at the team and their background. Read about their experiences and their previous accomplishments and whether they are in line with the project they are promoting. And then see to it that you reach out to them.