Question regarding ICOs and Exchange platforms

[blamekarma]

Hello, everyone!


I am still new to the crypto trading and before I have chosen to decide any action I thought of a scenario that I am fairly confused with.
What happens when a cryptocurrency is pre-listed on a platform, that is not hosting ICOs, but the cryptocurrency themselves has an ICO?
Can they sell their ICO with a fixed profile through a user profile on those platforms? What occurs when something like that happens or how would the investors and exchanges react? I am not certain whether this is a discussion for economics or here.