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Apple refuses to call Apple Intelligence 'AI'
(www.engadget.com)
This is a most excellent place for technology news and articles.
It's spyware in that both applications are a centralized searchable repository that knows exactly what you did, when and how. And no, the supposed ability to limit specific applications is not a difference, MS also said you can block specific apps and devs can block specific screens within an app. They're both the same on that front, presumably.
What I'm saying is the reason people are reacting differently is down to branding and UX.