  Touché!  I rejected this update on my Win 7 PC but -unexpectedly- found it installed on my  Win 8.1.1 laptop. So promptly removed it from there. The problem will be with Win 10 because we'll no longer have the option to accept an update or not. They'll ALL be force fed to us and unless we're vigilant and MacoStupid is honest about what each update does, we'll never know what they're stealing from us. And even if we do know what an update actually does, unless MS provides a way to uninstall it, we're stuck.  MS may -unintentionally- spur a new breed of hackers who investigate every single update in minute detail and develop tools to uninstall the objectionable ones.  
Just got offered update KB3022345 to install Windows Diagnostic Tracking Service for Win 7 Pro, which is standard part of Win 10. Here's what MS says: DiagTrack - The Diagnostics Tracking Service When you acquire, install and use the Program, Microsoft collects information about you, your devices, applications and networks, and your use of those devices, applications and networks. Examples of data we collect include your name, email address, preferences and interests; browsing, search and file history; phone call and SMS data; device configuration and sensor data; and application usage. For example, when you: Sounds like just any other keystroke logger... NO THANKS!
Windows Diagnostic Tracking Service