And the precedent has been set when it comes to these kinds of monetization strategies. It has been normalized by FIFA, Overwatch, Clash of Clans, and every other game that has MTX of some sort.
We can even point blame at the XBox game store for this, for being early to the "abstracting the currency you're spending from real currency" race.
All these casino games are doing is sliding down the slippery slope already carved by these other industry giants.