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It's not clear that he's decrying hate speech so much as decrying the amplification effect on it that the current state of the tech world enables.

> Wouldn't a non-centralized version of the web make it harder to police said speech?

It might make it easier, by not connecting to those parts of the decentralized web where hate-speech is prevalent. Of course, this might then amplify echo-chambers.

You wouldn't be able to control what people publish on their own devices, but for those people to be able to spread their (unwanted) content would be presumably harder.