>How is anyone better off now that he's banned? People who didn't watch him still don't watch him. People who did watch him still watch him ( maybe moreso because they downloaded his app ), and people who were on the fence maybe think he was right.

Existing on a platform has two undesirable effects that are relevant here: 1) It legitimises them, to a degree, by putting them in the same place as honest and factual sources; and 2) It provides zero-friction paths to more followers. If one path to getting inside somebody's head requires being retweeted by somebody they already follow, and the other requires them to visit and re-visit an external domain, one of those is _much_ more likely to catch people.