I don't know why they all make the same mistake of hiring literally a thousand people after their one big hit. Only Mojang seems to have kept small enough to sustain themselves in the long term.
I guess it's not a mistake if you are a highly paid CEO with shares that grow exponentially in value as your firm does. Exit quick or at least sell off some of those shares before it goes to hell and then move on to your next job having "been at the helm of a company with thousands of employees".
Maybe I'm too cynical.