It doesn't fit:

- the early adopters (don't publsih that type of content much)

- nor the early builders (don't need it themselves).

So, for now, you have very few of both.

A pinterest-like app that algorithmically curates images from the web based on your interests (or even generates them) might be easiest to bootstrap since you don't initially need users to publish + curate content. Privacy and Algo-selection would be the main value prop.