From an extensive Twitter reality check; also see Twitter says Infowars hasn't 'violated our rules.' It looks like that's not the case (CNN)
"The fracas over Jones illustrates a lot, including how good reporting and peer pressure can actually force the platforms to act. And while the reasons that Facebook, Apple and others banned Jones and InfoWars have to do with hate speech, Twitter’s inaction also confirms what fact-checkers have long thought about the company’s approach to fighting misinformation.
“They’re not doing anything, and I’m frustrated that they don’t enforce their own policies,” said Angie Holan, editor of (Poynter-owned) PolitiFact. “And their attitude seems to be that they’re just doing nothing compared to what Facebook and Google are doing to combat fabricated news and hoaxes.”"What's the matter with Twitter? -- Poynter