Good, and frankly they should have been doing this sort of thing sooner.
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But the fact of the matter is that the Citizens United ruling grants private corporations the right to free speech. He can continue to use Twitter, but they've literally got the right to campaign against him, editorialize, shadowban, or straight up ban him. He could choose to follow the site's rules, or run off to Gab. But he's doing it for attention and his tantrums and Twitter's non-enforcement actions are getting him a lot of that.
The government does not grant rights