https://www.techdirt.com/articles/20200911/14421045287/content-moderation-case-study-pinterests-moderation-efforts-still-leave-potentially-illegal-content-where-users-can-find-it.shtml

Summary: Researchers at OneZero have been following and monitoring Pinterest's content moderation efforts for several months. The "inspiration board" website hosts millions of images and other content uploaded by users.

Pinterest's moderation efforts are somewhat unique. Very little content is actually removed, even when it might violate the site's guidelines. Instead, as OneZero researchers discovered, Pinterest has chosen to prevent the content from surfacing by blocking certain keywords for generating search results.