I should probably raise this on meta (and I will when I have a bit more time than now). It seems that we have quite a lot of tag-wikis which are copied from Wikipedia (or MathWorld, EOM) without any attribution where the text is copied from.

I'd say that it might be reasonable to include the source if the tag-wiki is copy-pasted.

To be more specific, the tag-wiki edits by this user seem to be of this nature. (At least the ones I have looked at.) I have edited some of them.

Today I have edited the tag-wiki for tag finsler. Basically I wanted just to add the link. However, to submit the edit I had also to fill in the tag-excerpt - which was empty.

I did not like the text from this rejected edit too much. I put there: "For questions about Finsler geometry."

Somebody who is more familiar with the intended usage of finsler tag could make further edits, if needed.