If a server tolerates hate speech or harassment, you can go elsewhere, preferably somewhere that blocks your previous server.

But there are other kinds of speech that must not exist - either because they are illegal or because they enact harms that can't be mitigated by going elsewhere (or both). The most spectacular version of this is #ChildSexAbuseMaterial (#CSAM), a modern term-of-art to replace the more familiar "child porn."

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