Most of the casino projects are not listed on a popular exchanges which I don't know why. Many of the exchanges they are listed are not that known and this alone do many users to be afriad of losing there funds and coins to exchange that has no reputation. How I wish some of these casinos coins are listed on popular exchanges, that will attract more investors to keep buying.
The major exchanges review the project community before listing any token. If the community is large, they list it. If not, they don't list.
So far I have not seen any such gambling project whose community is large so that it can be listed on any major exchange.
If a coin has a large number of users, then we will list it. Thats the overwhelming significant attribute. Consider for example meme tokens, even though I personally dont get it, if its used by a large number of users we list it. We go by the community, my opinion doesnt matter.