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That's just the nature of this open publishing model. People will use the tags they think are appropriate. They can be modified in the future, as necessary. Check my Hub called Using a Hub Milestone to Make Hubs More Searchable and Accessible http
I went to the learning center and found out that I was wrong the learning center says tags "Are keywords and phrases that describe your Hub. Tags can be important for people using a search engine to find Internet material on topics"