The view from the AI establishment is that Apple is constrained by its lack of a search engine (which can deliver the data that helps to train neural networks) and its inflexible insistence on protecting user information (which potentially denies Apple data it otherwise might use).
An Exclusive Look at How AI and Machine Learning Work at Apple
Steven Levy

Apple’s problems with AI (+ it has no search engine -> quality of Siri answers is constrained)

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