It's the same thing, just one company has taken it further. I realize this is a slippery slope argument, but when there are countless examples of how this slopes is slippery, I think it's a valid point of contention.
A text ad on the first page of a book is not a slippery slope to a billboard right outside your window.
I use a Linux terminal everyday. I completely forgot it has any ads at all until reading this thread. I have to put conscious effort to find where the ad is.
It would be impossible for a daily Windows user to forget their OS has ads.
My 2 cents at any rate