Doesn't stop them drop simply dropping their stint at Meta.

(Also, it would be surprising to hear that Meta ever gives a reference worse than "I can confirm Foo was employed with us from x to y and I can make no further comment.")

Reminds me of why I always advise people to have a friend check their references:

Decades ago my SO went through a stint of over a year where absolutely no one would hire her, she'd get offers but they'd abort at the last minute. Finally, she landed a temp job through friendly introductions for a help desk line for the local government.

After a long run as a temp they decided to hire her on full time and put her through the normal hiring process. She got a call from HR about a problem with her references: The pharmacy she'd worked at for several years claimed that she worked for two days then no-showed and that was it. Eventually she got on the phone with them and HR and it was discovered that some other person in another city had been in their system with the same SSN and they were reading off the wrong record.

It was only because she had already been doing the job and was well liked that she had the opportunity to learn what was happening and set the record straight. Without that who knows how many more years she would have continued getting turned away from work.