Which MacOS (Sierra) Services are spy services/daemons from Apple?
Diagnostic and usage reporting services are controlled in System Preferences → Security &amp; Privacy → Privacy → Diagnostics &amp; Usage. Uncheck both boxes to disable reporting.

You would have been asked to opt-in to reporting when you first set up your computer. You are recommended to use the official switch in System Preferences to disable this reporting. There's a handy switch for you to use, unlike a certain other OS!

If you really want to manually disable the services…

launchctl unload -w /System/Library/LaunchAgents/com.apple.ReportCrash.plist
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.ReportCrash.Root.plist
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.DiagnosticReportClea‌​nUp.plist


With regard to what is reported, full details can be found in that System Preferences pane:


  If you opt-in to sending diagnostic and usage information to Apple, it may include the following information:
  
  
  Details about app or system crashes, freezes, or kernel panics
  Information about events on your Mac (for example, whether a certain function, such as waking your Mac, was successful or not)
  Usage information (for example, data about how you use Apple and third-party software, hardware, and services)
  


About Diagnostics &amp; Privacy