I looked it up, and it seems that one issue is that Google, as a DMA gatekeeper, is supposed to provide anonymous data to other search services, but in practice, important parts of the actual data have been removed. The other issue is that competing AI services (not just Gemini) should also be allowed to run integrated app search.

Reading about it, both points seem valid to me.

Also apps need to be allowed to conduct their transactions outside the appstore and the appstore must allow them to advertise that.