Not the case at Twitter
Still I probably wouldn't do the amount of overtime they require of workers at SpaceX and Tesla
With respect to Twitter, perhaps the engineers drawn to work there are interested in the future vision for the company and the engineering that such a vision will entail. Not to mention, even in its current state, it is a global social media company with 100s of millions of users that I'm certain presents interesting engineering challenges. What cutting edge, successful tech are you working on that makes you so willing to disparage the work of Twitter engineers as "not self respecting"?
It even goes beyond the job, e.g. does one read research papers or code at home? That would usually make one a better engineer, but it's not great for work life balance.
And when whole teams work long because management demands it, what you usually see is tired people wasting a lot of time.
What a waste of talent ...
There are plenty of horrible people who are CEOs out there (and plenty of companies that do actual evil), I think you're grandising Musk a bit due to him being a public figure.