Twitter has a history of great flexibility for famous accounts. E.g., in 2017, Twitter introduced the "newsworthiness" exception for tweets pretty much guaranteeing that anything he says is allowed under the rules. Many people feel that Trump gets much greater latitude compared with what some 20-follower anime-avatar account would get.

I certainly believe that's the case. In some ways, Trump saved Twitter. Their numbers improved greatly when he came along. Even ignoring the fact that banning Trump could be incredibly bad for Twitter in PR and regulatory aspects, kicking him off would cause a significant hit to key metrics.