Board Thread:Support Requests - Getting Technical/@comment-25372787-20150330175748/@comment-1038387-20150330182901

Discuss it with the admin team of the wiki in question. You can find them by navigating to Special:ListAdmins on that wiki. Explain attribution, link them to the Help:Licensing page, explain the negative impact on SEO, that kind of stuff.

Different wikis have different policies on copying from other sites, but (AFAIK) from a legal point of view, you only have standing if you are the original author/copyright holder of the original text. In that case (and only in that case), turn to Special:Contact/general.