From just this page it's rather unclear what triggers this... if an fdroid app that does not use any Play libraries has a purchaseable thing on another site, is

From just this page it's rather unclear what triggers this... if an fdroid app that does not use any Play libraries has a purchaseable thing on another site, is that in scope? Do they need to add Play libraries to track it, or be smacked? If yes, it'd certainly explain their "developer verification" effort, as it's a way to enforce rent extraction.