Projects without a team behind it does not means its a scam, some of them have a group of people they call team, but does not really exists, necessarily take precautions though if your going to invest, for best results, dig in more information on that project, and its a good way of asking anyone which is in the same projects as you are. But usually its better they have a team, a working project, and the links of the team or the transparency they gave their members. Be cautious.