It's a nice idea, but I'm not really sure why a crypto player would do it. You're selling 900,000 EUR worth of tickets for a chance to win 650,000 EUR prize. While by itself, I'd say despite the huge house edge -- it's probably not terrible -- as you're just buying a bit of fun. However, the part that makes it really unappealing to me is there doesn't appear to be any effort to have a provably fair drawing. Which to me, seems like kind of an easy process: you publish a list of all the tickets, and then take a future bitcoin block hash % ticketNumber to determine the winner.