This is a question for the law, not for the mob. The internet, thanks to a completely fucked up legal regime (section 230), is currently very gray.
Facebook and Twitter, which are commonly used to facilitate large-scale violent riots and play host to far more doxxing and cyberbullying than kiwifarms could ever hope to, get a pass despite being the main facilitator of that communication. In contrast, infrastructure services like Cloudflare (and even AWS) have been subject to intense pressure to drop other sites where people say bad things.
Under this theory, we need to be taking Facebook and Twitter offline immediately. And maybe also the phone company too.