Well of course simply projects where you can earn quickly, but there are projects where you need to wait, but they really are worth it. I think all of the traders should know how to do a detailed research about icos.
Basically ICO's were meant for investors now it turns out to be a traders thing. 
Any people who want to invest on ICO's need to know about the potential level of project but most of the people doing it just like gambling or investing on that project if more people invested on that,but only few people invest on the projects after much research about it and most of the time they will get bags of money.