Today i received a email from stumbleupon team

Thank you for being part of internet history.

Wow, after 16 years, the day has come. Today is the last day that Stumbleupon.com exists online, and as we head into this moment, we want to look back and thank you for making StumbleUpon an internet legend.

I have been looking to the ico projects and found that almost every project have advisors. So what is the main role of advisors in ico ?