The thing with selective enforcement is that then anyone with claims against Twitter can claim that their moderation attempts are all in bad faith, because they are selective - thereby opening them up to libel.
>>koheri+(OP)
Maybe, but did you read my post? You need a cause of action. It is not libel to moderate someone's tweets, so even if § 230 does not protect them you can't sue them for libel based on their moderation.