For those who dont know what IP (Intellectual Property) games mean, because I see a lot of persons are avoiding this topic but I think this is unique.
IP games are games that portrays a true character from a story, brand or design. For example Call of duty, Grand Theft, God of war, Spider Man.
When I was growing up, I played Super Mario in SEGA. So imagine these games and their characteristics integrated into an online casinos, it will attract more people into gambling.
This explains why there are some countries where you can't play specific games, more also about licensing. I remember I watched a documentary about this, and during the early days of computer/console gaming, these were the problems of most publishers.
But now, with games for casinos. I believe it also applies the same, and considers also different laws, restrictions in different countries or jurisdictions. But then again, right now, a lot of piracy happening ,especially ithe n gaming era, so I believe we can relate it to some illegal casino platforms that operating without proper license or government documents.