Why will a team of a project decide to be anonymous and they are expecting people to invest in it. To me any team that can't come out clearly about their project and be proud of it is no go area either if it is scam or not scam.
Often, it is just such cases that lead people into a big mistake because people, after they understand that they will not bear any responsibility, they begin to seriously say that they are real, but do not really show themselves.