A very detailed engineering post is available for those who’d like to learn more about the technical details behind this Private Processing technology, so if you’re an engineer or simply want to understand how it works make sure to check out Meta’s blog post.
Thankfully, no one is forced to use the new feature. Using Message Summaries is optional and, more importantly, it’s off by default. If you decide to take advantage of this feature that uses Private Processing technology, you’ll also be able to use Advanced Chat Privacy to select which chats can be shared for AI features.

Message Summaries uses Meta's Private Processing technology | Image credit: WhatsApp
As far as availability goes, this is a bit tricky. Considering the status of AI and some of the restrictions imposed by various countries, Message Summaries is rolling out in the English language to users in the United States only.WhatsApp says that it plans to bring it to other languages and countries later this year, but did not offer more details, so we’ll just have to wait and see where it lands next.Regardless of whether AI is here to stay or it will fade away in nothingness just like the now defunct 3D technology, CDs and cassettes, it’s important make the best use of it while it still exists. Message Summaries seems like a nifty feature that many WhatsApp fans will end up using. The question of privacy remains no matter what Meta says.