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/about/faq.html#copyright), for example, http://mathoverflow.net/tags/axiom-of-choice/infohttps://mathoverflow.net/tags/axiom-of-choice/info is copy-pasted from http://mathworld.wolfram.com/AxiomofChoice.html.
Some other tag wiki edits by this user copy-paste material from Wikipedia, which allows commercial use, but requires attribution. However, no attribution is given. For example, http://mathoverflow.net/tags/calculus-of-variations/infohttps://mathoverflow.net/tags/calculus-of-variations/info is copy-pasted from https://en.wikipedia.org/wiki/Calculus_of_variations.
