For example:
The AI would decide what bet to lose, from a whale betting 1 BTC or from 100 users betting 0.01 BTC or something like that.
It's an interesting idea, but I don't see how it could work. Your first issue is going to be that if it's not predetermined, it's not going to be provably fair. But if it is predetermined, it's going to be vulnerable to players exploiting it (see the Nash equilibrium).
As a casino operator, my goal is for players have a great time ... but ultimately (over a long time frame) end up losing. Often I see a new player come to the site, and hit some really bad luck, get destroyed. It's bad for the player (who enjoys that) which makes it bad for me.
So there's some merit in the idea of having some "AI" that boosts unlucky players with some "good luck", so they don't get absolutely destroyed. But in order for that to really be feasible, the site would have to do the opposite to lucky players. But now if you have a casino that boosts the luck of unlucky players and decreases the luck of lucky players, which lowers variance and stops being an exciting casino and something more akin to an inhumane abattoir. Not really particularly appealing for players.
I have however read studies on some slot machine players, where they're actually not really looking for a high-variance thrilling experience but actually looking for stability and time-burning and predictable and hypnotic with the chance of a giant jackpot. Perhaps your "AI" idea could work there, creating a more controlled experience.