Think about this... If more things forced auto-updates, we might not have been forced to support ie6 for so damn long. It's a trade off. Instant security patches, instant support for new standards, etc, all without having to worry about all of those users who just
will not press that "update" button. Sounds like a pretty decent plan to me.
I would be fairly surprised if Microsoft didn't re-display TOS after each update, so feel free to keep an eye out. If you really really care about this kind of thing, then I might suggest avoiding products that are tightly integrated with private entities as a general rule.
