>Now imagine a world where meta knows exactly how much I make and all the other information about me. I’d probably get a minor bump over my previous salary.

Not necessarily. People don't change companies for just any value greater than current TC. There is a big cost to switching companies -- it's going to shake up your lifestyle, you might lose some relationships, reset your company-internal network and reputation, reset technical and organization context etc. Possibly even moving your home (even if a new job is in the same city, people often move to be closer to it anyway).

As a matter of policy I wouldn't switch companies for less than a 30% monetary premium over my current TC (I'm a SWE), and other soft criteria like type of work and company culture. In my early career I've gotten 50-100% premiums each time I made a hop.