Comment by dns_snek

Yes in general. The whole entire premise of the DMA is that gatekeepers should have their power to meddle with competitors taken away.

Article 6(4).

> The gatekeeper shall allow and technically enable the installation and effective use of third-party software applications or software application stores using, or interoperating with, its operating system and allow those software applications or software application stores to be accessed by means other than the relevant core platform services of that gatekeeper.

By requiring notarization, Apple requires users and developers to use their core platform services in order to access 3rd party apps.