I just stumbled upon a workaround to this.
I had a free app in an Organisation folder and I wanted to get it back into my personal folder so that I could delete the organisation and retain the app. This is how I managed to do it:
- Made the app in question copyable
- Opened the link and made a copy - this copy went into my personal folder.
- Deleted the original app from the organisation folder.
- Deleted the organisation.
Voila!
Organisation gone, and app back in my personal folder.