https://www.cnet.com/news/twitter-doesnt-proactively-police-its-service-ceo-dorsey-says/

Two weeks ago, Apple, Facebook, YouTube and others kicked the harassing conspiracy theorist Alex Jones and his Infowars site off their services. 

But Twitter refused until Tuesday, when it suspended him for seven days after he effectively called on his viewers to take up arms against journalists and others. What changed?