And this is what percentage of the overall market for smart phones?
Last report I read, WP was sitting somewhere around 3% market share, with Android upwards of 70%. WP is certainly growing fast at the moment, but it's starting from a low base. So as I said before, Google will probably not be worried about annoying somewhat less that 3% of potential users (I say somewhat less because not all WP users will have or want to use Google services, and a certain percentage that do use some of the Google offerings like YouTube will be happy with what's available on WP at the moment).
Then why worried about revenue from that tiny market share. Honesty, as OP posted many 3rd party apps can't show the ads because of Google's api limitations. Release the damn app or let MS use the matadata or just shut the f up....It's not about protecting ToC, honesty, Google even don't care about beneficiary of ad revenue, it's about hating MS.....