I've just had a disturbing email from a user where an innocent looking iAd actually linked to a site with extremely explicit adult content.
The app in question is iAd-only and does not have any other ad network or frameworks installed, so the ad could only have come from iAd.
Not only has my iAd revenue dropped significantly in the last 1-2 months, the quality of ads seems to have declined dramatically too. It appears as if Apple has given control of iAd over to some third party without telling us. I'm aware of the iAd app network termination announcement, but there was no mention of anything like this.