I would add "Start any D&D thread on EnWorld and there is a high probability it morphs into a ptba or Fate discussion."
Maybe EnWorld should have a dedicated section for ptba and other story games. Users seem to want to talk about it a lot. Maybe they would stop proselytizing about it in D&D threads...
It generally comes up in contrast with more traditional games. I don't think there's a clamoring for discussing PbtA or Fate in and of themselves, there's instead a lot of desire for cross-pollinating discussion.