Primarily because the advertising systems are a bit different, in terms of how the creative is being uploaded to us, how it's stored and how it's managed internally. That's why I said it would be the kind of thing that we would work towards, but we didn't feel comfortable this time around that we could commit to that kind of turnaround time.
Evidence of meeting #148 for Access to Information, Privacy and Ethics in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was google.
A video is available from Parliament.