Everyone has a Western zodiac sign. It's directly derived from the date of birth, which already has a metadata field. There would seem to be no reason to apply this category except perhaps self-applied to genealogist member profiles by persons for whom it is significant.
If there were sufficient interest it should be possible to display or query profiles based on Zodiac automatically based on the birthdate via a software solution rather than peppering millions of profiles with manually-applied zodiac categories.
Then there's the little matter of someone having "Cancer" without qualification as a category being semantically ambiguous with the much more common meaning of a malignant disease, and the dual use of the same category for both purposes (e.g. under Causes of Death). It was removed as a subcategory of Causes of Death, yet it has been used both ways.
See e.g. [[Baker-32327]]. She died of cancer, and her sign is Cancer. What is the meaning of the category?
Edit: We do have the Cancers category for causes of death, so there is no reason for mistake per se, but it still seems improper to apply as a category a zodiac sign to a deceased or living person who has no significant association with their sign. Certainly, there are people from cultures which do not use Western astrology and/or have their own forms of astrology, and others who have philosophical or religious objections to astrology, where at the very least this would give their sign undue weight.