I am not sure that is going to fly though. Apple is the conduit in this case. The developer is still the distributor and has chosen to do so through the store.
Analogously to this case, if my local store doesn't refrigerate its milk properly, I don't sue the dairy farmer. Apple's App Store is a store in exactly the same sense.
If your grocery store fails to refrigerate otherwise perfectly good milk, the analogy to the App Store would be that Apple injected GPL code into the app.
No, if Nabisco violates a copyright agreement with the box design of some cookies, and your grocery store sells them (unknowingly), the grocery store is not at fault.
Car manufacturer : producer. Car dealership : distributor.
Software developer : producer. Apple App Store : distributor.