I agree, I don't think they have any limit. Look at how invasive platforms like Facebook are, and yet they're still massively popular. Mobile operating systems are several times worse than Windows is for privacy and data harvesting, and people clearly don't care at all. They'll even happily consent to ever more levels of it - there's no evidence to suggest that they'll ever stop.

One of the biggest "mistakes" Microsoft made was not realizing how lucrative data collection could be. Back in the quaint old days of early PC computing, spyware was actually considered a bad thing. When Google came along, that philosophy was flipped on its head. Over the past 15 years, Microsoft has seeing what these spyware vendors are doing and salivating because they know that they are still the kings of computing - they still have total control the PC market and there's a good chance that it's not really going anywhere because most people hate change - even though Linux is starting to make inroads in quite a few places.

It would not be surprising if, in a few years, a Windows OS looks like a Google search page, or a cable television channel.