Personally, I would ask them specific questions regarding the ICO project itself - how did they come up with the idea for it, do they have previous experience in ICO's (as the answer on this one builds credibility), how are they proceeding with their marketing campaigns and are they experiencing boost in sales and high return on income, what is the value that this ICO adds to individual traders (besides profit) and does it resolve a real life problem, whitepaper, etc. The types of questions that I can come up is (probably) infinite, as there are always uncertainties. However, let me tell you something: I have actually contacted teams before prior to investing in a project. For example, I have invested in ICO's such as Bountie, Monero, Titanium, Red pulse but I never got to talk to the teams behind these ICO's (I paid the price from some of these "bad investments"). However, for projects such as Cointed, for example, I did contact their team prior to buying. The project seemed trustworthy and promising, however, I wanted to make sure. The team responded immediately both in Facebook and on Telegram. To be honest, their frank and timely responses actually converged me into buying.
This is exactly what I am talking about, I can't get such first hand info from Google. This is real life experience. Thanks a lot for your response.