Its pretty amazing that realdonaldtrump@ was not a part of this. I guess the controls on that account are at an even higher level than elon musk/obama.
It might also be that impersonating a government official is a serious crime.
Sure, the hackers here have committed a crime, but this was more of an embarrassment for Twitter than anything else. If they had posted from Trump's account though...
It is also that many people will not think it is a hack . Trump does post all sorts of things . There is no tweet from his acc will surprise me that he actually posted it
So if people are less likely to think it is a hack, then they're more likely to send bitcoin in response to a tweet from his account. They'd hack Trump's twitter first if they could.