What you're saying really boils down to whether or not you think capitalism makes sense, which is a much bigger argument, but ignoring that --

Who defines "should be earning"? You?

Currently, we let the market determine it. It's fine to say you don't like that system, but that's the argument you should make, not "Big game companies are unfair". They're just playing the game the way we set it up.

Alternatively, you could maybe argue "I believe it is possible to make AAA games, pay high salaries, and actually make profits all at the same time", which would be an interesting take, and you could maybe explain how.

But saying "this is worker exploitation" is an uninspired, unproductive argument, IMO.