It is very hard to identify nowadays the legit and scam ICO.  There are some which started legit but it will suddenly disappear in the circulation.  As far as I know, any business run by a strong team, well trusted and professional advisor will lead to a successful come out.  I addition to this, if the project are totally supported and endorsed by the top rating investors.  Whitepaper and roadmap are well prepared.  All links are perfectly will appear in their affiliated channels.  But if we notice that the budgets, the token payments and their promises are unbelievable or being unrealistic, scratch it out to save our time, effort and money.  This is only based on my study and researches.