On long run bankroll investment must be profitable, otherwise the casino doesn't have a house edge, furthermore is going bankrupt, or it's scamming the investors somehow. What you can't expect from this kind of investment are fast returns, but if you are patient the profit will come after some time, even if the gamblers playing on that house are very lucky.
More longer you wait then there are chances for you to make more profits because house always win in long term but in crypto everyone wants to become rich very quickly for such kind of people casino bankroll investments are not the best choice.
Maybe it could also be an idea not to gamble at all and just save the funds? you can also place bets on a match with odds from 1.01 and then built up your stake on sport matches.