> Which other unfair advantages?

If you're unaware of how this issue negatively affects salaries for women and other minorities, I respectfully suggest you do a little more research on this topic. Here's a quick google hit, but there are many, many more resources: https://www.bbc.com/worklife/article/20220929-the-us-push-fo...

> Another way to look at this is that the employee is selling the employer a service.

Which would be a pretty ideological/libertarian way to present it. This isn't an auction; it's how people eat and put a roof over their head, and they have no choice but to play.