I always thought a rock paper scissors game should be a dapp, that way you do not have to really put it all on a website, you could just make it decentralized and that way you could have two people gambling without having a centralized system. Sure the dapp could still make money from it, after all why would anyone work tirelessly just to get nothing in return, obviously there has to be some profits.
I would say building one shouldn't really be too hard, and if you make a dapp rock paper scissors system possible while also keeping yourself out and just have the tokens taking the profits of the system, you could even sell the tokens and make a big amount beforehand as well. Idea is good but the execution could be improved a million times bigger to make way for a lot more stuff and have bigger potential.