https://techcrunch.com/2020/05/04/tumblr-now-removes-reblogs-in-violation-of-its-hate-speech-policy-not-just-the-original-posts/

Tumblr is making a change to how it deals with hate speech on its blogging platform. The company announced today it will also remove the reblogs (repostings) from any blogs that were suspended for violating its policies around hate speech. Already, the company says it’s identified nearly 1,000 blogs that were banned for blatant violations of its hate speech rules. Most of these blogs contained Nazi-related content, it said. This week, Tumblr began to remove all the reblogs from these previously banned sites, as well — a number totaling 4.47M individual posts.

In an announcement, Tumblr explains its reasoning behind the decision to also remove the reblogged material: