About Casino, I am not sure if that could work. In general the idea is to ask (fact certification Oracle) who is the winner of the match? And than majority would take the decision who is the winner. The fact certification Oracle is always cover the whole network each of the member to make a vote must to invest some amount of coins that coins would be returned back in case if his answer would be part of the majority even the voter could get more coins in case if someone would put the vote to the opposite side. Of course people gonna be motivated to vote on the correct answer.

About the stake, the have a special conception called Quadratic Staking you don't need to have any stake to make a bet but to vote in fact certification Oracle your identity in the network must be validated. The validation in the network happening regularly (currently the period of each validation is equal to 12 days. It's called Epoch) depends on the network size. People to keep validated status must solve a special test called flip, which looks like a series of images that represents a logical story that has beginning at the top and end at the bottom, more information you could find on the official website idena.io. The point is that the network because of the that flip test accepts only humans as Oracle validators each of the validators has a special status which represent kind of advanced eco-sytem with a special rights and privileges. Also, people must pass the test for each of the epoch but this is a separate topic, the point of that conversation is that network members taking a decision after the match is over and based on that decision the contract unlock the prize fund to the favour of winners. That's why there is no needs to have any KYC and everything is 100% on-chain and anonymous. The platform is always getting the interest from each of the bet and bettors splitting the prize fund of losers. So, it's like WIN/WIN strategy.