Very interesting idea! This would be a great system to have in the crypto space.
I only see one issue, depending on the country the player is in. There may have different gambling laws. How would you deal with possible future government interference? To the Government this might as well be a black market lottery system :(
Good question, if the volume gets to big I would just register a company in a country with good jurisdiction. Af for the jurisdiction of the country from the player, that is up to the player.