Ask yourself, would you risk your capital by building a casino with 0% edge for nothing? And since there has to be liquidity, who would provide that? Even with 5% edge casinos are risking losing short/mid term a lot.

I wouldn't put my money anything like that.  With 100% rtp and 0% percent edge, there would have to be completely different system, but who would build and run that and for what purpose? Because it's not profits unless it's a scam. And in that case you are the exit liquidity.

It's like with any free product online, you don't actually get the product for free, because you are actually the product they are benefiting from.