> Not that it's any excuse, but Apple does something similar by saving your photos to iCloud and deleting them from your local storage without telling you.
The setting is (intentionally) confusing too: "download and keep" implies that photos always have to transit via iCloud first, and the default is ambiguously named "optimise storage" rather than something more explicit like "move photos to iCloud".
The setting is (intentionally) confusing too: "download and keep" implies that photos always have to transit via iCloud first, and the default is ambiguously named "optimise storage" rather than something more explicit like "move photos to iCloud".