Definitely there will be requirements to this process of enlistment and this has to do with each particular exchange with their own requirements before they can enlist a coin, also know that there's risk in doing such because you may not actually finds out the real state of the developers of that coin or project and same applies to the exchanges that make enlistment, not all exchanges are reliable, some have no reputation can can easily low down their requirements to ensure they enlist as many as possible cryptocurrencies which many may turn scam at the end, but ones we know the risk involved in both the coin and the exchanges, we will know to further our research before investing on one.