> The impression I get is that third-party apps are disproportionately used by the kinds of users that supply content more than average

Are you saying that most users who post content also use third-party apps, or that most third-party app users post content? There’s a big difference here.

Back of the napkin math: You have to pay to post with some third-party apps like Apollo which has 50k subscribers. Reddit has ~500M monthly users, so we’re looking at… 0.01% if every person subscribed to Apollo posts. Even with a 10x safety factor, there’s no way shutting down third-party apps has a meaningful effect on the volume of content posted to Reddit.