Lotteries are a no-go in the crypto gambling scene. A lot of people will argue that the game will be rigged and there is no way to confirm its legality, nor the authenticity and integrity of every draw. There had been lots of similar ideas in the past that simply didn't work out because the community understands that this is not something that is going to work nor win them money.
People will certainly stick to casino games though, as they think that these platforms are legitimate enough to not on them of their money due to their licensing and all those kinds of stuff. There are no guarantees of winning on casinos either, but the odds of people winning on them is kinda high compared to lotteries.
I certainly agree with this, with plenty of addictive games online, people won't risk their money when reputation are in question. AFAIK, lottery are only popular when it's state sponsored, but from someone or a company that would start to make its reputation in the crypto gambling world, that's a tough journey to make as the kind of game isn't marketable anymore.
@Bill buffalo, I know you read some negative comments, it's not something to discourage you but to tell you the truth about your plan. However, if you really want to pursure, please consider doing a calculated risk.