[bcjordan]

If the service ($) actually develops an employee to a higher level of performance, the employer gets the benefit of a more senior hire who is already at their company instead of having to recruit ($$) and on-board ($$) one & hope they work out ($$$).

Even if they need to give the current employee a healthy raise ($$) to retain them, they'd still probably net save money.

(in theory)

If some high % of employees who use this tool discover they really ought to be working elsewhere, well, that's probably better for the industry's cost/productivity as a whole, so everyone wins in the end yayy!! But sure maybe it's optimal for an employer to hide this sort of tool if they rely on employees having inefficient market information to retain them & that somehow fits with their ethics...

(Looking at you, the giant companies that got sued for their illegal informal non-competes...)