They are now adding all that spying to windows 7 and 8.1 and a lot in the form of updates
Microsoft Retrofitting Windows 7, 8.1 With Windows 10's Privacy-Invading 'Features'
http://www.dreamteamdownloads1.com/piracy-warez-legal-hackers-scams-internet-news/782103-microsoft-retrofitting-windows-7-8-1-windows-10s-privacy-invading-features.html
So looking like neither windows 7 or 8.1 will be safe either