Apparently there is a keylogger in the Windows 10 Technical Preview that sends all data to Microsoft as you type.

I’m too busy with other things to run Wireshark and actually figure it out for myself, so for the moment I won’t be using the Tech Preview any longer, at least not until I can take measures to prevent this.

I understand why they did this, I just don’t want any part of it. Just an FYI for anyone else using it.