Re: Windows 10 not private.
"Yes the speech recognition is public and I have heard some."
Rather unlikely. as a) it would have been all over this site and the rest of the internet, and b) Microsoft would likely be on the hook for large fines for such a privacy breech.
Here is what they actually do with your Cortana data and how to control it: https://privacy.microsoft.com/en-us/windows-10-cortana-and-privacy