It's been a cutthroat start to the year for Apple:
The iAd App Network will be discontinued as of June 30, 2016. Although we are no longer accepting new apps into the network, advertising campaigns may continue to run and you can still earn advertising revenue until June 30. If you’d like to continue promoting your apps through iAd until then, you can create a campaign using iAd Workbench.
I've got a new app ready to be released that has iAds in it, but now I'm going to be switching to a different ad network before release. It sucks, but I'm glad that this has been announced before I've published rather than after.