They kinda do - I'll admit honestly that the final game I played in the cryptocurrency space I played solely to profit. (It was a minor, uh, **coin that didn't have a lot of redeeming value to start with). Though it turns out the incentives remained somewhat aligned: I ended up providing the developer with some security bug fixes to make sure someone couldn't mess with the cash cow. :)

(To be clear: We were just optimizing mining; in the process of looking for ways to mine it faster, I found some security bugs and fixed them. We weren't exploiting the bugs, that crosses a line for me.)