Indeed, but I do think they are aware of it since they do offer "Signature Edition" computers, which require manufacturers to not install additional software.
Well with Windows 8 and now 10, MS is tarnishing their brand, albeit it in different ways. The uncertainty over what MS does and inability to shut it off (apparently updates undo settings?) is why I still don't use W10. :\
I'm in the same boat, and just want to add that they encourage that feeling to stay away in me by doing the same in my win 8.1 install. I have to 'ignore this update' for the windows 10 update (kb 3035583 I think) every single time I 'check for updates'. Seriously?
There was a time when PC vendors had preinstalled applications — honest-to-goodness applications, not bloatware — as a competitive advantage. For Microsoft to forbid this would probably be called out as anticompetitive with regard to those applications, even though no one does that any more.