Windows 10 Insider Preview Build 16179.rs prerelease 170414-1642 how to uninstall and get out of windows insider program
Windows 10 has a option to revert back to previous build as long as you hadn't deleted the folder "windows.old"
I am not in the least bit concerned about privacy. I am concerned about security. Privacy was gone a long, long time ago. Remaining secure is a much larger concern.