[remram]

This is a second-order objective though. The goal is to show ads to humans on the platform. Having a lot of human authors (or any kind of content authors) generating content is a way to achieve the goal, not a goal in itself.

There are other ways to achieve the goal, such as making ads more relevant (targeted advertising), having users consume more of the same content (recommendation), having the same content take longer to consume (periscope). Growing the number of human posters is definitely not a requirement.