A few hypotheticals I'm curious about: 1. If Coinbase itself had purchased a bunch of coins before listing on its own exchange, would that be illegal? 2. If the employee had purchased coins that were correlated with the ones that were listed, but not the specific ones that were listed, would that be illegal?
The thing is if they take enough measures to prevent their employees from doing it. It's hard considering they can do it on another exchange, but at least on their own exchange my understanding is they should prevent their employees from trading if they have privileged information.