It doesnt. The uninstaller removes everything the installer creates. There are the file type handler entries that calibre creates that are not removed on uninstall as they are not created by the installer because they are per user and the installer runs system wide. These are harmless but can be trivially removed with a single command at any time:
calibre-debug --default-programs=uninstall
Reddit is full of people that *think* they know a lot more than they actually do.
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