Looks like the problem with DMA has more to do with giving full access to other providers outside of the on-device + private cloud compute architecture. The way I interpret the newsroom post [1], Apple doesn't want to give third-party providers full access to user data when the third-party providers cannot run on private cloud compute for privacy reasons, but the EU wants them to offer the choice anyway.
[1]: https://www.apple.com/newsroom/2026/06/due-to-dma-siri-ai-de...