Trump is the first public figure they outright banned who was in a position of high political power, but I'd assume this won't be the last. If you look at their pattern, they banned people like Alex Jones in the past while giving a free pass to those that support/engage in left wing violence.
Seems people were fine when Kathy Griffin posed with a severed head of Trump. No ban there.
griffens career took a major hit, overall people were not fine with the photo shoot.
Trump used twitter to assemble an angry mob that stormed the capital. People died.
Who the fuck cares about her career hit. If some actor did that with Obama their career would be over and they would be barred from the public. Holding the severed head of the President is insane and warrants a ban, IF the rules of Twitter were every applied evenly. I really am not sure how you could justify her not being banned.