Yes, but pages with Adsense ads on them are of poorer average quality (I'm guessing) because there is so much spam. Google have an obvious conflict of interest

Yes, but pages with Adsense ads on them are of poorer average quality (I'm guessing) because there is so much spam. Google have an obvious conflict of interest preventing them from doing much about this. That conflict of interest is just about my only real grievance with Google; I'm otherwise a happy Google user with no incentive to switch. Why wouldn't MS exploit this? The suggestion isn't that they suppress Adsense pages altogether, just provide an option to filter them out.