Most people do find fulfillment out of work, many even enjoy it, myself included. That doesn't mean that we shouldn't fight to be compensated for what we put in, and doesn't mean we shouldn't practice solidarity with coworkers, many of whom don't have the time to work as much as we do (for example a working mother).

Everyone, even billionaires undergo social conditioning from an early age. Some people have a need to be successful in order to feel good about themselves. they feel they need to "be" someone. And for some, their work becomes a part of their identity.

Becoming a billionaire doesn't free you from all the stuff that's been conditioned into you.

I called Elon’s boss and he corroborated it. His boss even makes him use one of those punchcard machines—how quaint!