I have think about this and i can't find an answer, how will you know that a team cares about investors without trying them out first? promises comes first from every project's team and you will have to give it a try to know the end game
The answer to this is very simple. You read comments and opinions of those who did deal with them and know something. If there's nobody like that you have to investigate yourself.
For starters you can check if their photos and credentials are real. If they're lying about their previous projects and experience or don't want to give their real names it means they're not trustworthy.