[adornKey]

I wouldn't trust users for tagging. Let the AI tag things and let the users select what flavour of AI they want to use. The biggest problem are the people.

Especially people interested in tagging are really bad. Sane people have a life and don't have time for things like that. Web forums with a reputation system have proven that power users with a lot of reputation usually are the worst. After Usenet died it was like the trolls went to web forums, and as power users they were granted admin rights.