Hey dirt_mound! apologies for the super late response, running through my community backlog as I'm catching a breath after all this coding :)
About private collections: the "redesign" was released under a tight schedule, and the version you tried was just displaying the collection as a web tab — and, because of the lack of auto-login, it broke private collections. Collections now have a proper in-app view that works for both public & private ones :)
> Why are collections listed under My Creations
Overly zealous redesign on my part! The 'My collections' is also there again in latest versions of the app.
About "Things you gave money to", the wording has been changed and will ship soon. I'm still not sure what exactly should show up in "Library" vs "Installed", still trying to think of what's the best course of action here.