During the re-tagging of questions, tags sometimes become orphaned from existing questions.
Are these zombie tags ever removed from the tags list?
What if a tag is misspelled and needs removed? How do we get rid of it?
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Tags not associated with any question are automatically destroyed at 03:00 UTC every day.
Tags which are misspelled should have the questions under them retagged to the appropriate tag, which will result in its destruction due to having no uses.