Cloudflare decided to stop serving the forum for being a “cesspool of hate” whose “lawlessness has caused multiple tragic deaths”, the company said.
The website has repeatedly been used by suspects in mass shootings to spread their “manifestos” and reasons for carrying out such attacks, and has often hosted far-right messaging and imagery due to its known stance of being neutral about moderating content.
In a blog post in the wake of the two shootings in El Paso, Texas, and Dayton, Ohio, Cloudflare chief executive Matthew Prince suggested the suspect in the El Paso attack had posted to 8chan before commencing the attack.
8chan’s owner Jim Watkins has hit back in a video posted to YouTube, claiming that the El Paso gunman posted on Instagram before it appeared on his platform.
“First of all, the El Paso shooter posted on Instagram, not 8chan,” he said.
“Later, someone uploaded a manifesto, however, that manifesto was not uploaded by the Walmart shooter – I don’t know if he wrote it or not, but it was not uploaded by the murderer.
“We have never protected illegal speech, as it seems, that we have been accused of by some less-than-credible journalists, we have responded with both vigour and integrity every single time that a threat of violence has been posted and information on it has been requested by law enforcement.”
The words of Cloudflare’s boss have caused Mr Watkins “tremendous damage”, he added, but he admitted they have the right to terminate business as a private company.
“Contrary to the unfounded claim by Mr Prince of Cloudflare, 8chan is a lawful community, abiding by the laws of the United States,” he continued.
8chan’s founder, Fredrick Brennan, who says he resigned from the website in April 2016, has called for the site to be shut down, suggesting that the current owners do not care about the issues associated with it.
Writing on Twitter about 8chan, he said: “Finally this nightmare might have an end.”
8chan was created in 2013 as an alternative to the 4chan forum which had become popular with gamers.
It was launched in response to perceived increased moderation on 4chan and promised less intervention or removal of content.
Removal of Cloudflare’s services leaves 8chan open to cyberattacks designed to disable the platform.
At present the site is inaccessible, though Cloudflare’s boss believes that it is unlikely to remain permanently offline – pointing to a previous incident where the firm cut off far-right website The Daily Stormer, only for it to reappear online using a “Cloudflare competitor”.
Mr Watkins said in the video that he was working to restore 8chan.