Author of "Careless People" banned from saying anything negative about Meta

https://www.thetimes.com/uk/technology-uk/article/sarah-wynn-williams-careless-people-meta-nrffdfpmf

Meta stole Sarah Wynn-Williams’s voice. It couldn’t stop her exposé

The author was gagged by the firm after her book, Careless People, alleged sex harassment and censorship. Its actions prove her point, says her publisher

The Sunday Times

My understanding is that as part of a severance package she received in 2017 she agreed to some kind of "non-disparagement" clause. She then went on to write a book disparaging the company. The arbitrator didn't rule on the disparagement itself or if anything was true or false. Only ruled that she had to abide by the contract she signed.

It sounds like an interesting book, and I'll add it to the list. But it also sounds like she agreed to this in exchange for a lump-sum severance payment, and then broke the contract anyway. I'm not sure if this is really that principled of a thing. She sought-out and accepted a lot of money for this agreement.

It should not be legal to enforce this kind of thing 9 years after a person leaves your company. I get that it currently is legal, but have some principles. Just because this is legal doesn't mean it isn't morally reprehensible, and its legality should be challenged.
That's a ridiculous constraint to put on the freedom to enter into contracts.
So allowing someone to sign themselves into slavery should be "legal" because it's "impinging on someone's right to enter contracts"? I get that some people balk at "morally reprehensible" as some sort of slippery slope, but c'mon we as individuals have to function somewhat coherently. As a social species reliant on some form of social cohesion (how much oil did you refine this morning?) we have to have some guidelines.
Fwiw, I think making such non-disparagement clauses illegal is an interesting idea, and could be a net positive. That said, I think the slavery comparison is a stretch. The situation up for debate is: Should you be able to voluntarily accept money in exchange for promising not to say bad things about someone or some company? I don't see a good faith interpretation of that as "signing yourself into slavery".
Nobody was trying to equate non-disparagement clauses with slavery. The relevance of slavery here is as an example of the kind of contract terms that everyone should be able to agree are rightly invalid and unenforceable. Any argument in favor of contract enforceability that would apply to a slavery contract just as easily as it applies to a non-disparagement contract is a bad argument, or at least woefully incomplete. Bringing up slavery serves as a necessary reminder that the details and nuance of the contract terms and their effects need to be discussed and argued, and that an unqualified "contracts should be valid" position is untenable and oversimplified.
The general principle is that you shouldn't be able to "sign away" something that's a constitutional or human right. Like the right to freely speak, the right to practice a religion, the right to be paid for work, and so on. Imagine if the severance contract specified that she had to convert to Islam in order to get her severance, or that she had to sacrifice a child. No court in the country would consider those clauses conscionable. Yet, somehow companies are allowed to gag your free speech as a condition in a contract? It makes no sense why this is allowed.