Deletionism
Deletionism is a wiki management style to remove content that is of limited interest to the core demographic. Historically on the most popular wiki, this group was disproportionately young, white, male, and living in western Europe, North America, or Australia.
Deletionism, as with all editorial strategies, has the potential to introduce bias. As an example, many wikis are filled with sports trivia but lack information about manufactured products, inventions, and artistic endeavors.
Deletionism is also used as an excuse to move valuable content to Fandom (formerly Wikia), where it can be monetized.
Another reason to adopt deletionism is to protect the privacy of non-notable individuals. Many of these prefer that their personal information not be aggregated on a public wiki.
There is also the argument that poorly-sourced content reflects badly on the rest of the wiki and has the potential to introduce errors.
Paul Graham has written:
23. More open alternatives to Wikipedia. Deletionists rule Wikipedia. Ironically, they're constrained by print-era thinking. What harm does it do if an online reference has a long tail of articles that are only interesting to a few people, so long as everyone can still find whatever they're looking for? There is room to do to Wikipedia what Wikipedia did to Britannica.[1]