Then if Apple chooses to serve this market demand by allowing unnotarized apps to be sold in their store, they must allow third party app stores to also sell unnotarized apps.
The key thing here is that the Apple App Store and third party app stores must be on an level playing field to compete on.
The problem with this reply is it starts with the phrase "if Apple chooses". My point is it stopped being their choice when they sold the hardware to someone else.
Well if you want that you will need something other than the DMA.