It is good to know that the addition of altcoin for betting purposes on their platform is already in the plan. If I am asked, I will also not miss TRX, DOGE, and XRP as suggestions. I tried all of that to use on other gambling sites. And I have nothing to say about the speed of their transaction especially at a very cheap fee. This is very easy for small gamblers.
XRP is good to use for transaction and save fee but still have fast confirmation. XRP has its drama with SEC's lawsuit and many exchanges announced or planned to restrict or delist XRP on their exchanges. It is not good option now. TRX is very cheap and Dogecoin is commonly accepted on gambling sites and exchanges. It is an old altcoin with cheap fee and acceptable transaction speed.
Specially now that most of fees on known coins like BTC and ETH are really on that high side which means switching to coins or tokens would really be the best alternative to save up from fees and also with the transaction time.It would really be great on adding up this kind of option and that would really be giving out some more convenience on possible bettors of this site.
Listing a new coin requires investigation from the team. Developer team, products, reputation, pros and cons from transaction fee, speed and risk on the service and users or future lawsuits, past reputation. Many things and as an owner, one exchange can accept or reject to list a new coin. It will create new requirements and resources from maintenance, broadcast, approve withdrawal requests, not easy.