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I think the answer to why is not documented either by Apple or in the plugin. One reason is the file size, as documented by Apple, but I think there is a more important reason.
A fundamental issue with SQLite and iCloud is that backing up a SQLite database is generally not an atomic operation. SQLite database and rollback or update journal files could change at any time if backup happens while the app is running, so it could be corrupted on the iCloud.