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?)
added value?
hmm did bitcoin brought added value or redistributed it away from the established financial system?
secondly added value is possible no problem, but then you have to look for efficiency,