Oh yeah. Such examples are simply millions, when people trust a good idea, and as a result they are left with useless coins that do not cost anything. Its impossible to remain in incomprehensible projects for a long time.
if you are in a project like that, it would be better if you had to leave and look for another project that was more convincing. because really understanding and choosing a really good ICO project is really difficult, where sometimes project development is very slow even at a successful ICO.