This is laughable. Social graphs are not trivial. It may not be as complex as landing a rocket booster on a platform, but it’s definitely as complex as monitoring a car.
Twitter had 100M MAU after 3 years and it was still operated entirely by just 300 people. So it’s not that hard. Musk could easily recruit 300 engineers and cost will be peanuts to him. Additionally, early growth of Twitter was driven by various celebrities signing up and bringing their audience to the platform. Here Musk has unique advantage as he has huge celeb network which can be convinced to move over or at least cross post. He can count on enabling slew of features like edit button, more chars, easily verified accounts etc to lure many users. Musk can hang in for years and easily eat up the cost. Earlier competitions did not had these advantages.