edit: amusing, people downvoting labor liberation and freedom, amazing shit; votes
for labor captivity by trillion dollar corporations then eh
This is a terrible idea.
You may be a lot more valuable vs what they were previously paying you. Perhaps you were being undervalued, or the new company has a need for you that places a high premium on you. So now the former company can veto your future and hold you at your previous income.
The new opportunity also may far exceed the past opportunity in potential compensation (in your estimation, even if it's a wild-eyed thinking), or the opportunity is one you want to take and it's not the money driving you. That veto that is holding you in place, is a potential economic straightjacket and is also a veto over a choice to pursue a quality of life improvement by taking a better / more fulfilling job.
Hyper rich corporations like Amazon will hold talent hostage just to deny them (and their expertise) from another company, which is entirely unfair to the employee in question. The tech giants already frequently roach motel talent as it is and they've been doing it for decades, I'd hate to see this practice further entrenched (and particularly against the will of the employee).