User blog comment:Brandon Rhea/Wiki domains will be changing from wikia.com to fandom.com in early 2019/@comment-36238216-20180820081319/@comment-27345308-20180820094501

Displaying the same content on multiple domains would be really bad for SEO. If half of the clicks go to  and half on   URLs, both will get less clicks than other sites and therefore fall down the search engine listings.