It's really difficult to know whether the ICOs are scam or not and based on my experiences I joined a lot of signature bounty campaigns that are actually scams and trying to get money from young investors and innocent people.
You can't usually rely on their website, their team and staff, their project and their white papers because everything can be fake in internet.
For me telegram channel will tell you a lot of stories because the number of people or members of their Telegram will likely enough to be true or not.
But, in the end of the day we couldn't tell the difference between scam and legitimate.