The only technicality protecting Apple from massive anti trust regulations with regards to the store is that the iPhone actually isn't a monopoly in cell phone

The only technicality protecting Apple from massive anti trust regulations with regards to the store is that the iPhone actually isn't a monopoly in cell phone unit shipments. However, many economists have noted that app revenues (not advertising) is highly skewed towards Apple's platform. When will a $100B app market stop being treated as a feature of physical phone unit shipments, worthy of its own independent regulation?