When Windows 10 came out, the telemetry, MS account features, forced auto updates/reboots made my computer feel like it was no longer my own. Having used Microsoft OSes since DOS, this was the straw that finally broke the camel's back. After dabbling in Linux for years, this was motivation to commit 100% to using Linux as my main OS. It was mildly painful at first, but after sticking with it, I would never go back.
My favorite thing about Linux is that it does what I tell it to, and that's all it does.