I think Apple uses 'security reasons' as a cover to advance their monopolistic business models, in a way to keep their platforms locked down, and a way to extract a minimum 30% transaction osst and yearly fee for access to their walled gardens.
Monopoly isn't defined by share of whatever market description you find convenient, it's defined by pricing power: whether the seller can raise prices over some range without losing sales to competitors. There's lots of times when things in what intuitively descriptively are the same market by some product description are different markets in practice because people don't, in practice, substitute between them in response to price movement.
A monopoly (from Greek μόνος mónos ["alone" or "single"] and πωλεῖν pōleîn ["to sell"]) exists when a specific person or enterprise is the only supplier of a particular commodity.
My hypothesis is that Apple uses 'security reasons' as an excuse for their lack of dominance in voice assistants + machine learning. Siri's suggestions are virtually nonexistent compared to Google, Amazon, or even Microsoft's offerings. Siri's extensibility is entirely local, meaning that all new functions you want to develop for Siri need to be packed inside an iOS app for the user to install rather than a cloud function. Siri's 'app suggestions' to the user are also inferior, usually defaulting to the apps you used most recently.
