Unless the company is legally binding themselves to actually pay you when the time comes (as in, if for any reason they rescind the offer, you’re still paid for

Unless the company is legally binding themselves to actually pay you when the time comes (as in, if for any reason they rescind the offer, you’re still paid for, let’s say, a year of salary, and this without you having to sue them), I don’t see any reason why the employee should feel any more obliged, legally or otherwise.