[xenobioticants]

Here you go:

  # Privacy: don’t send search queries to Apple
  # Safari
  defaults write com.apple.Safari UniversalSearchEnabled -bool false
  defaults write com.apple.Safari SuppressSearchSuggestions -bool true
  # Spotlight
  defaults write com.apple.spotlight orderedItems -array \
     '{"enabled" = 0;"name" = "MENU_WEBSEARCH";}' \
     '{"enabled" = 0;"name" = "MENU_SPOTLIGHT_SUGGESTIONS";}'

Also turn off Dictation in System Preferences > Keyboard > Dictation. I'm guessing you're smart enough to already have disabled Siri.

Voila! More privacy.

[bdcravens]

The fact that such hacks (which really aren't known beyonds developers) are necessary makes a very loud statement.

[stouset]

No, the few things these switches are toggling are nanoscopic in the grand scheme of things, and the data sent are only that necessary to implement an ostensibly useful feature.

Compare to the shit that Windows 10 collects, and the comparison isn't even remotely close.

[eridius]

They're not necessary at all. They're available, but really you shouldn't care about them unless you're very paranoid. These settings are basically the equivalent of telling your computer "I don't ever want to search the internet unless I manually navigate to google.com (or whatever) and do the search there". Because that's what you're doing, you're disabling the internet-enabled search functionality.

[aq3cn]

You can go to group policy (gpedit.exe) in Windows 10 pro to switch off most of privacy related settings. There is a good description written for every settings.