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Just to give some background on this project: it's indeed something I'm doing on my own, independent of Stack Exchange. There are more independent 'volunteer' projects around the Stack Exchange ...
The problem seems to be more serious: the tag wiki edits by this user seem to copy-paste material from sites like MathWorld, which requires a license for commercial use (http://mathworld.wolfram.com/...
As pointed out in the question, the problematic tag-wikis came mostly from a single user. Since this user has deleted his account in the meantime, they can be no longer found through his profile page. ...
Since there was a moderator flag, I went ahead and performed the edit to the question based on asm's "answer" and evident intentions.