I believe a temperance movement is on the horizon. The fact that we've turned smartphones into vice dispensers (and surveillance devices but that's another topic) is one of the greatest failures of western society.
You don't think the Play Store or the App Store are just giving out those apps and not making money from it, do you?
The app platforms are not only complicitous, they're enabling gambling by allowing these apps at all. It would be very simple to take them all away with TOS that banned gambling apps.
What platform has the ethics to do that? None.