Not arguing in favor of banning A/I, but the US administration claims A/I email services were used to coordinate sabotage actions. I mean, that's as stupid as saying telephone networks or paper sheets were used to coordinate sabotage actions.

Furthermore, the noblogs.org platform (previously hosted by A/I) is used to host a lot of politically-motivated content, including news and statements by various resistance groups across the world, which of course is considered terrorist by the USA, but legally should fall under freedom of the press.