I would disagree with you about the list. In my opinion decentralized casinos and ecommerce are one of the areas that are in desperate need of a blockchain technology and decentralization. Just image what would decentralized casino do out there when you can access it without any problems and bet without worrying about laws ? I don't support it but... I would like a world with a bit less control over my life. Not to mention decentralized ecommerce DONE RIGHT
There are already fully functioning decentralized marketplaces out there such as OpenBazaar or BitBay. Casinos might be a bit more tricky as their require lot of transaction throughput, which I think is unfeasible to achieve without payment channels. They would also require either web or desktop application and some backend that would keep track of states in the game. I'm not sure if all this is possible to do in a decentralized way.