[pxc]

It's about comparability of the two operating systems with respect to similarity to 'adware' which is characterized by

  - nagging
  - online accounts
  - tracking user behavior
  - 'free' cloud services (the user is the product, blah blah blah)
  - having an adversarial relationship with your own tools; having to go to extraordinary lengths to disable user-hostile behavior

which are all very much implicated in products like Siri and in being unable to actually disable it.

When you think seriously about what adware is like and what actually makes it so odious, it's clear that parts of macOS are characterized by many of the same traits and behaviors, even though Apple isn't selling third-party ads in macOS the way Microsoft is doing with Windows.

[revscat]

Siri can be disabled via the “Siri” panel in System Settings.