They're an organization who's purpose is to commit copyright infringement. They don't have to be doing the infringement on twitter itself for twitter to reasona

They're an organization who's purpose is to commit copyright infringement. They don't have to be doing the infringement on twitter itself for twitter to reasonably suspend them. Again, they suspend them to prevent the platform being inevitably used for direct infringement or to be used as a guide on where/how to participate in the infringement. Twitter may not be responsible for user content as per section 230 but it's also not a good idea as a company to step on the toes of intellectual property holders without good reason.