At the moment, even communication with team will not save you from fraud of any kind. Main thing you need to recognize - Does the idea brings added value to the industry or not, than you'll decide to invest or not. This is not 100% guarantee too, but who wants to kill the working business?)
Yes. Team can ban in chats if you ask them questions they do not like and answer only questions that they want to see. That happens all the time.
In any field this is so, not only in the ICO.