Not to be picky, but the GPL would not stop someone "making major changes, and releasing it as proprietary software for consoles and make a lot of money in the process."

The only difference is that they would be obligated to release the source code. Given that the list of folk who can compile for consoles is very limited, this would not be an existential burden for them.

Indeed, even if they targeted a common development platform, like a PC or Mac, they would still be able to offer lots of value, and easily sell copies if there was a market for that. The vast majority of players would happily pay $49 for a compiled version of the game rather than go to the effort of compiling themselves.

In other words, the GPL and MIT licenses are orthogonal to making money - making money selling compiled GPL programs is not hard - assuming the program has some value to someone.