I think they're well on the path of replacing the "legacy" development structure with entirely closed, iOS-only app development since Swift Playgrounds 4:

https://screenrant.com/publish-ios-apps-ipad-swift-playgroun...

To me it feels like a waiting game - most people under 20 have lived their entire lives within "walled gardens" aka "what's a computer". The EU has already failed to break this cycle, if the DOJ can't do better and Apple can derail smaller countries efforts then this restrictive model will become entrenched as normal over the next two decades.