Considerable attention has been paid by researchers to social media platforms, especially the ‘big companies’, and increasingly also messaging applications, and how effectively they moderate extremist and terrorist content on their services. Much less attention has yet been paid to if and how infrastructure and service providers, further down ‘the tech stack’, deal with extremism and terrorism. Content Delivery Networks (CDN) such as Cloudflare play an underestimated role in moderating the presence of extremist and terrorist content online as it is impossible for these websites to operate without DDoS protection. This is evidenced by the takedown of a wide range websites such as The Daily Stormer, 8chan, a variety of Taliban websites and more recently the organised harassment site Kiwifarms following refusal of service by Cloudflare. However, it is unclear whether there is any formal process of content review conducted by the company when it decides to refuse services. This article aims to first provide an analysis of what extremist and terrorist websites make use of Cloudflare's services as well as other CDNs, and how many of them have been subject to takedown following refusal of service. Following this the article analyses CDNs' terms of service and how current and upcoming internet regulation applies to these CDNs.

中文翻译：

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通过删除服务进行内容审核：内容交付网络和极端主义网站

研究人员对社交媒体平台（尤其是“大公司”）以及越来越多的消息应用程序以及它们如何有效地调节其服务中的极端主义和恐怖主义内容给予了相当多的关注。人们对基础设施和服务提供商（“技术堆栈”）是否以及如何应对极端主义和恐怖主义的关注要少得多。 Cloudflare 等内容交付网络 (CDN) 在缓和网上极端主义和恐怖内容的存在方面发挥着被低估的作用，因为这些网站在没有 DDoS 保护的情况下无法运行。 Cloudflare 拒绝提供服务后，The Daily Stormer、8chan、各种塔利班网站以及最近有组织的骚扰网站 Kiwifarms 等大量网站被关闭就证明了这一点。然而，目前尚不清楚该公司在决定拒绝服务时是否进行了正式的内容审查程序。本文旨在首先分析哪些极端主义和恐怖分子网站使用 Cloudflare 的服务以及其他 CDN，以及其中有多少网站因拒绝服务而被关闭。接下来，本文分析了 CDN 的作用。服务条款以及当前和即将到来的互联网监管如何适用于这些 CDN。