What you mean believed? On my perspective, I like IEO in terms of profiting but this isnt guaranteed of the greatness of the project. For sure they are legit and have funds to get listed on big exchanges but it is not mean that they have a good or interesting project. ICOs still have chance since the people who are really into crypto will understand if the project has a future or not. IEO is good if youre plan is to made profits.