Why would anyone use MS spyware & data harvesting /sharing services , better still why would anyone who values their privacy upgrade to win 10 ? Nothing wrong with other versions of windows that where designed for non touch screens
Because most people will just hit the upgrade button because Windows told them to. The majority of people have no knowledge of what MS is doing behind the scenes - nor do they know what Google does behind the scenes when they use Google Search/Gmail/Maps/etc. Most users just use their computers and don't give it a second thought.
And even being in IT I have upgraded a couple of machines - mainly because MS collecting what it does has no real bearing on my life - they can do what they like with it.