Isn't that basically how tech careers work? We switch as often as vesting or the willingness of better companies to take us allows.

That is how price discovery in any market works. The more often buyers and sellers engage in transparent transactions, the more knowledge market participants have of supply and demand curve movements.

Note that for buying and selling labor, price is not only the amount of currency being exchanged, but will also include things like work schedules, work environments, break time, location, etc. I prefer to think of it as $x per a certain amount of quality of life at work.