They want the money of some people especially those beginners.
Especially those new ICO, out of 10 projects , maybe there are only 2 projects are legit. Maybe we can say they are legit but it will slowly disappear and abandon their project. This is normal especially in the world or cryptocurrency.
Yeah, 90% of the project out there are to scam only. Some of them while are easily identifiable with fake teams and plagiarized whitepapers or site.
It has been going on like this from the start. There isn't a party to check their profile and verify them properly so it's a lot risky to put money into projects nowadays.