most of the icons that fail are due to unavailability of funds when crowdfunding, or not reaching softcap, most likely it can happen due to less promotion, less attractive bonuses, and most importantly the idea of the project that is less desirable
Yes, that's true without those things, the ICO will eventually fail because of lack of promotion and funds. That's why it is very important that the team will bind as one together for the project to success.