The important aspect of this story that we should be talking about is the incredibly bad idea it is for the POTUS to use Twitter has is primary communications platform. Twitter is not a defense contractor, they haven't been contracted by the government at all. The only have to operate by their own user agreement, which is wholly insufficient for the role they are playing.
An unknown number of employees with unknown backgrounds have the ability to put words into Trump's mouth, and that doesn't include anyone who manages to hack into a company that doesn't have to conform to government security regulations. They could crash the stock market on a whim. They could destabilize world peace. The potential damage is almost incalculable.
And the person at fault is Trump. Twitter isn't obligated to take care of this guy. He shouldn't be using it in the first place. He just doesn't care.