Not to undermine your concerns, for you raise fair questions, but this is justifiable behavior on Twitter’s part for a simple reason: Twitter is blocked in PRC.

It seems fair to block the activities of even entire governments to operate on a platform that is itself blocked from operating normally in that country. Governments are not above reproach or criticism anymore than corporations are. If PRC will not subject itself to fair scrutiny or allow their subjects to participate on Twitter’s platform, then why should Twitter have to play or even allow PRC’s game on their platform, especially when they are blatantly breaking Twitter’s rules and intentionally trying to deceive Twitter’s users.