Yes, searching for a local file or program 100% of the time because I would never intentionally search for anything else from there.
That's specifically for Windows Start. If Ubuntu or Siri "web searches" are clearly distinguished from OS searches, then of course I'd expect them to send data somewhere.
Wait, how do you know that does search per keypress? I've just tried in Windows, and it doesn't seem to do anything until I press enter when the loupe is selected.
How exactly are these keyloggers?