It’s the DMA regulation that forces Apple to give the same access as they have to other AI chat apps.

Once it leaves the device Apple does not know what those other ai chat apps will do with the gathered data.

> Siri AI is private by design and deeply integrated across Apple’s platforms using on-device processing and Private Cloud Compute, which extends the privacy and security of iPhone into the cloud. However, under EU regulators’ extreme interpretation of the DMA, Apple would have to give any virtual assistant direct access to users’ private data — and the ability to directly control other installed applications — as soon as Siri AI is made available in the EU, without the essential protections necessary to keep users and their data safe.

If you view it like that, any argument against openness could be made in the name of privacy. With that interpretation, the Mac is terrible for privacy as you could just chose to install an app that reads your hard drive.

"We can't bring Time Machine to Europe, because we would have to allow other backup solutions, and that would mean other backups would have unrestricted access to your data"

Maybe there's more to it, but I'm not giving Apple the benefit of the doubt after their hostile strategy regarding third-party app stores.