They probably have some checklist which has vague definitions of “glamourising” gambling. I reckon this game unwittingly strays into the red tape in its presentation along with the poker theme (like I’ve said elsewhere it’s more a maths game than a poker game). The music and lights despite being atmospheric and ambient probably have some similarities to fruit machine like environments in the sense the music is repetitive and there is flashing visual feedback.

Edit: Should say it’s still B.S. to rate it 18. Just that I can imagine ratings boards can’t apply independent thought/logic.