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Unity is the de facto engine for a number of the interactive gambling machines you find in U.S. casinos.

From my experience, the gambling companies aren't particularly good at engineering, so using an off the shelf engine is a given. And you can be 100% sure they aren't going to use anything with a revenue share model.

I would guess it's because of regulatory compliance. You really don't want to release slots with a major payout but, and if you do, you want to be able to throw the blame at Unity.

Uhm, no? Unity is just the UI. The RNG algorithm runs on a centralised server.

The real problem is that the gambling business model is inherently incompatible with revenue sharing, because unlike a video game, you're paying money back to your customers every time they get a small win.

Let's say a gambler is wasting away $500 and getting back 95% every day and he plays until he runs out of money. Then unity would be getting $400 and the casino would be getting $100.