As shared with previous posters, you will be overwhelmed with ICO sites when you google them. So, in order to determine how legitimate the site is, I search their traffic in
https://www.alexa.com/siteinfo I wouldn't say the most traffic is the key for the legitimacy, I believe it will give a bit of trust.
Nice hack. I like to use
to verify the following of twitter accounts for ICO's. Crazy how many are payed but not surprising.