No, it would be foolish to operate like that. It’s not profitable anymore,  for casinos, that’s like running a charity. Even if it’s a 50-50 chance, where would they get the money to cover their operating expenses? They won’t allow that to happen.

The best they can do is increase the RTP, but not up to 100%.
Just enough to make it attractive to players, while still keeping some margin to make a profit.