ICs follow the lead that executives set. A chilling effect like this will cause folks who most _need_ the leave — single parents, people with family in need of care, or those struggling with their own health issues — to second-guess their choice, while those who can just walk away w/o any real risk can go ahead and try taking time away.
It also puts the lie to the idea that employer-subsidized leave beyond the federally-protected time window is an entitlement rather than an easily-canceled perk. We all know that rationally, but a BigCo obviously exploiting that trust is a good reminder that the company (any company) is not there to help you, they are not your family, and you have to be ready for this kind of “switcharoo” whenever the numbers (or politics) justify it.