I mean.. that's a pretty weird take. Most games have some sort of RNG - whether it be in the background or visibility listed probabilities. That doesn't mean they're promoting gambling.

The outrage over the 18+ rating was partially over other games with actual gambling (monetized loot boxes) are somehow PG / PG-13.

Meanwhile, this game with no in-game purchases and is only thematically about "Poker" is 18+ because it's "promoting gambling".. If the game had an artwork swap they'd see it as a typical deck building rougelite and rate it the same as Slay the Spire.