Because you call it "enhanced functionality featuring cloud services", not a "man in the middle attack".

And calling it enhanced is not always an unreasonable interpretation. For instance, take the case of a cheap mobile phone with a very limited bandwidth. You can increase the end user satisfaction considerably if you move some of the functionality to a server layer so that when you browse, the things actually happen somewhere in a cloud and your phone is just displaying the result, without being the actual browser as seen by the site you visit.

Nokia did this with some of the cheaper devices, and I think it was quite OK. It comes down to how much you trust that party, of course, and how critical your communication is.