Fact.
I’ve observed file storage double, triple, and quadruple in a team just because an app is duplicated and referring to the same files (stored only once…all referring to the same storage url) in the same tables. If I duplicate an app within a team, I may or may not be duplicating the table data, but I’m definitely not duplicating the stored files that those tables are referring to. This has been an issue for a very long time.