because most of those ICO Founders are people like you and me, they have no money to make eyecatching advertisements with famous crypto influencers.
They just may know how to organize an ICO...
Even if there is only few funds available to for this project they still need to improve the advertising and also the marketing too, it's really important for a project to become successful. Maybe they should open a referral program or giving more bonuses.
Well, there are some projects before that don't have funds but able to handled funding of their project. The success of a project will be base with the strategies and good plan of the team.