Because I feel like the answer to that is yes, and I can already see myself in the future writing something angry in the comments section of an article on HN that exposes some evil/stupid shit Microsoft did with this, or happened as a result of this.
I'm not against the concept of using a thin client for development, but it just doesn't seem smart to me do it in such a way where you have to place trust in a company that, throughout their entire existence, has consistently proven that you should not trust them, because they have no incentive to (and thus never will) act in your best interests. It's like if Facebook released their own web browser and "promised" to respect your privacy; you'd be an idiot to believe them.