I think this betrays a fundamental misunderstanding of how markets work. If you are a smart business, you don't charge what's "fair", you don't start by saying "I'm going to pay $X to my workers, so let's see how many I can hire with that money." Those are bad ways to run a business. You hire the number of workers you need to run your business at the price the market will bear.
This is something that gets drilled into you if you take any entrepreneurship classes: things cost what the market will bear, there is no concept of "fairness" that entrepreneurs should be thinking about. You pay as little as you can to make something, and you charge as much as you can for it, and those are largely independent variables from each other.
The idea that Amazon is going to stop hiring workers if they get more pee breaks... that's just not how markets work. If Amazon could afford to let those workers go, it would have done it already. If it doesn't need those workers and it's hiring them anyway, then it's just a badly managed company.
Similarly, if you get rid of labor laws and reduce the minimum wage for Amazon's workers, it's not going to hire twice as many people just because it has the money. It'll increase its profit margins, because it's a business being run by smart people who understand how supply/demand works. You're talking about the market like supply and demand form a constant ratio with each other. They don't.
It's not just wrong because reality is more complicated and in practice the simplistic models don't always bare out (although reality is more complicated and these simplistic models rarely capture how everything will work out), it's also wrong because it's fundamentally bad market theory on a simple level. Nobody starts a business deciding that they're going to pay a constant amount of money that gets divided equally among all of their workers. At least, they don't think that way if they want to stay in business for very long.