Better still if it has a mobile app.
I still keep asking myself my most crypto casinos do not have mobile apps as compared to their crypto exchange counterparts despite all of them being in the same industry and some making nice revenue out of it.
It's not always needed. On some casinos you stay logged in indefinitely until your log yourself out manually. And the mobile version of the casino is made to fit nicely to the phone you use. An app helps but playing without one is ok. Google and Apple are pretty strict with gambling apps on their stores. They host them but they are subject to many rules. The majority of people have little knowledge of installing .apk files and apps outside of those popular stores. Then there are also geo locations to consider. A gambling app available in one location is banned in two others, etc.