I (a non-US) watched Hillary in a documentary about her saying Bernie has never worked (in corporate/professional settings) all his life. If that's true, I don't think it matters to him.
It’s a joke. They are saying Bernie will never be a paid off tool of the corporations. Which he would never want to be anyway. And that’s why he lost the nomination.
Hillary is a very transparent corporate goon. She's never done anything out of the currently accepted status quo. She's entirely interested in what benefits her political career.