Now that access to Infowars is mainly through its website or app, Mr. Jones’s ability to reach new viewers is severely limited because they will no longer come across his videos while scrolling through Facebook or YouTube, said Monica Stephens, a geography professor at the University at Buffalo who has studied the spread of misinformation online.

“This increases the likelihood Infowars is preaching to a filter bubble versus reaching new audiences,” she said.

Another right-wing provocateur might present a cautionary tale for Mr. Jones: Milo Yiannopoulos, the former Breitbart editor. Mr. Yiannopoulos gained notoriety during the 2016 presidential race for his abusive language, and Twitter barred him that year for harassing the comedian Leslie Jones. He also lost his job at Breitbart after making glib remarks about pedophilia, and his public profile gradually faded.

Last month, Mr. Yiannopoulos lashed out at critics on Facebook, saying, “I have lost everything standing up for the truth in America, spent all my savings, destroyed all my friendships, and ruined my whole life.”

In an email, he wrote, “Social justice warriors machinate to get speakers canceled, and social networks purge conservatives, for the same reason: no-platforming works.”

Neither Mr. Jones nor Infowars responded to requests for comment.

Mr. Jones has long relied on Silicon Valley to distribute his message. His YouTube channel amassed 2.4 million subscribers and more than 1.6 billion views of nearly 36,000 videos it had posted since 2008, according to Social Blade, which tracks social media data. His success was due partly to YouTube’s video-recommendation algorithm, which, in an effort to drive clicks, pushed many users to Mr. Jones’s clips.

The main Facebook pages for Mr. Jones and Infowars, meanwhile, had drawn 668 million views of their videos over the past three years, according to Tubular Labs.