I'ts not totally true if the anonymous team is an indication for a scam, but for me i prefer to choose another project that has transparency for their team members. That way we could fully put our trust on the project.
It is difficult to determine the identity of the ICO developer because most of them are anonymous in this market. We tend to put a lot of faith in new projects with many promises that make us invest a lot. This will greatly affect our investment as it will be very risky