”in the EU, the DMA's changes will result in a less secure system.

We're limiting these changes to the European Union because we're concerned about their impacts on the privacy and security of our users' experience — which remains our North Star. These changes comply with the DMA, and in the weeks and months ahead, we'll continue to engage with the European Commission, the developer community, and our EU users about their impacts.”

https://appleinsider.com/articles/24/02/21/apple-defends-its-controversial-eu-app-store-plans