Well, dropping it may or may not be a bad thing, but it's really the only option that Twitter had anyway. If the government withdrew the summons, and Twitter w

Well, dropping it may or may not be a bad thing, but it's really the only option that Twitter had anyway. If the government withdrew the summons, and Twitter went ahead with their suit, the case would have been mooted by the summons withdrawal anyway, and would have been dismissed. They could potentially amend the suit for damages to recoup the cost of compliance with an erroneous and arbitrary action, but given qualified immunity, it would be a very high bar indeed, and would almost certainly set the wrong kind of precedent (which is to say that it would reinforce existing precedent.)