It is an _incredible_ stretch to frame certificate transparency logs as "content" in the creative sense.
The whole purpose of this data is to be consumed by 3rd-parties.
The whole purpose of this data is to be consumed by 3rd-parties.
But what GP probably meant is that OAI definitely uses this log to get a list of new websites in order to scrap then later. This is a pretty standard way to use CT logs - you get a list of domains to scrap instead of relying solely on hyperlinks.