Those companies are clearly not in the same position as twitter either. I have no idea why "trust Elon" should just be taken as a given.
And of course SpaceX, which wouldn't exists without government support.
Mind you, getting gov contracts isn't an easy feat – but it's a completely different than being successful in selling to corporate clients, like Twitter did.
Sum this all up and Musk is doing a very stupid thing: He tells employees to be more inefficient and create more bugs and problems because they have to work long hours now for ... what exactly? If I were someone looking to do "black hat" things announcements like that are a golden sunrise in the morning, an opportunity in the waiting.
From a business perspective this is just many levels of stupid.
Let me add here that I have a lot of personal experience when it comes to long (actual) working hours and consequences from that. The moment you have to crosscheck all the things, run tests and whatnot, you are confronted in a more immediate way with all the mistakes. Most of these so called high performers fall apart when subjected to such a strict regime, because they are normal humans like everyone else. There are outliers, and these people have deficiencies in other areas because their brains work a bit different, so this doesn't come for free, either.
Edit: Here, a nice link for you: https://en.wikipedia.org/wiki/Effects_of_fatigue_on_safety
For example, where I live there is a group of stupid idiots called "doctors" (and I suppose this is not much different elsewhere on this planet), who think they can deal with long working hours. Imagine you end up in hospital with a doctor who had a long shift or is maybe on the 2nd shift already, because "it is no problem!" (problems can be fixed with pills). I have a little red book about high altitude sickness here, and doctors are high up in the list of professions to die from that. Pills cannot fix everything.