there's a lot of scams in the internet. You need to think wisely but i don't think "Bitcoin" is a scam...
Bitcoin is not a scam but some of the people are using bitcoin to scam. Some of the people will prefer to gain fast money which mean that they will scam people to gain there investment. Before investing you should have research the ICO you want to invest if it is legit or a scam. Bitcoin is not a scam for me.