Trump's account is probably specially marked for two- or even three-person lock, to prevent "rogue account termination" as has already happened. So the questions quickly turn to odd angles: how many other high-profile, politically (and/or economically) influencal accounts are equally protected? What criteria are used to assign the account this level of protection? Should this kind of account lock mechanism be more widely available? If yes, to whom?

I personally suspect that Twitter will eventually have to follow Google's route for high-profile accounts and identity management in general.[0] If people are using Twitter as their personal press office, the company has no choice but to accommodate.

0: https://landing.google.com/advancedprotection/