Did you read the next paragraphs? It literally describes the details. I would quote the parts that respond to your question, but I would be quoting the entire post.
> This confidential computing infrastructure, built on top of a Trusted Execution Environment (TEE), will make it possible for people to direct AI to process their requests — like summarizing unread WhatsApp threads or getting writing suggestions — in our secure and private cloud environment.
We’re into “can’t prove a negative” territory here. Yes, the scheme is explained in detail, yes it conforms to cryptographic norms, yes real people work on it and some of us know some of them..
..but how can FB prove it isn’t all a smokescreen, and requests are printed out and faxed to evil people? They can’t, of course, and some people like to demand proof of the negative as a way of implying wrongdoing in a “just asking questions” manner.
Except the software running in TEEs, including the source code, is all verifiable at runtime, via a third party not controlled by Meta. And if you disagree, claim a bug bounty and become famous for exposing Meta as frauds. Or, more likely, stick with your reddit-tier zealotry and clown posting.
> This confidential computing infrastructure, built on top of a Trusted Execution Environment (TEE), will make it possible for people to direct AI to process their requests — like summarizing unread WhatsApp threads or getting writing suggestions — in our secure and private cloud environment.