I think they are confused with what an mobile app is and what a mobile web app is. Basically its difficult getting a mobile app up and running. It would need to be approved by Google and Apple and it will be difficult to get done since anything crypto related is diffult to list and same with gambling. So I wouldn't expect an actual Mintdice App found on the iOS store or Google Play.

However most gambling websites have mobile friendly versions of the website, so when the server detects that its someone trying to access the site thru a mobile browser it sends it to be a more "smaller screen" friendly page and people can easily play dice that way. It would be very difficult to play with the actual full screen where you need to zoom in and zoom out constantly. Bitcointalk forum is actually like that, there is no mobile version and it requires lots of zooming in and zooming out to browse. Its fine on an iPad but difficult if you are trying to read anything on an iPhone.