There are various kind of old crypto projects that has no team but still they are among the best projects today, I believe this happened because many old projects followed the footstep of Bitcoin, bitcoin would have been in tougher situations if the team or ceo is public I believe but today it's a complete different story or should I say experience? Since the birth of ICO we've seen tons of scam projects that aren't scared of revealing their faces even when they knew they are going to exit scam on investors fund, so for me hidden team members or not still doesn't make a difference..
If the ICO team does not want to disclose their names, then how to check this project and make sure that it is not fraudulent? For investors, this will be of paramount importance as fraud is a major problem in this type of activity. In spite of everything, I would not risk investing in a project with an anonymous team.