Or they were but it was kept secret. Twitter hasn't published a list, we only know of the BTC tweets. Maybe they actually were after other accounts' DMs and the tweets are just diversion to make it seem like an undirected attack.
Unless we hear from account holders that their credentials weren't stolen, there's no reason to believe that only those were hacked that sent tweets.
Unless we hear from account holders that their credentials weren't stolen, there's no reason to believe that only those were hacked that sent tweets.