For me it is easy to trust if you can see a good result as well as a good feedback. When I first knew ICO all I know is one way of being progressive that can lead to become successful. Their are different ICO to join through out the way. It is up to you how are you going to find way to join and extravert yourself to the highest rank to be better too.
Yeah, I agree to that because the feedback is the reflection of their performance to other people. You can see how well the ICO is through feedback. Being active of it will lead to development and success. Also, you make research of even gather information about that ICO whether it is reliable or not. Be wise in choosing ICO because there is also a scams in the crypto world.