Re: They own you.
I suppose that depends on whether you consider systemd, Unity or an upgrade to a new LTS version to be big enough to count as a new OS. Big OS releases aren't really the Debian way. Microsoft might (indeed might have to) argue that a minor UI tweak isn't an OS upgrade, especially if the Linux community has already got away with moving from KDE to Gnome etc. Personally I don't buy that argument but the lawyers could make it stick.
Automatic updates are off on my boxes. Just surprised that a Linux distro felt the need to change that. All very mother knows best and unlike Linux.