Oh yes, the good old "Let's do all it takes to meet demands of an unhinged billionaire even if it means crippling our own health in the process". Classic.
Cry me a river. I’ve lived on a farm - sometime you just gotta do what you gotta do…
If you call this level of expectation a "massive ego", then perhaps there is something that you don't understand going on here?
When it comes to Twitter, yes the ego is out of check, expecting employees to go above and beyond for something that is little more than a spam cannon.
That said, neither company's success could not be realized on a normal work weeks for all employees. Nothing SpaceX is doing has a hard time limit - they are not saving lives or winning wars. Its about revenue - short term revenue.