Anyone willing to participate in any ICO really needs to do their homework beforehand. Every piece of information needs to be verifiable. In the end it's up to you to decide whether the idea is worth investing in.
Before you invest on a project you have to do your own research always. As you said all informations must be clarified by the team and if you know that the project is legit, you have to know the team behind the project and they must give a costumer protection for example, if the project's ICO fails all the invested money will be given to the investors.