This is anyone running a business and a limited juxtaposition. It does not mean he always slaves away at a job. It means he must always be available and always conscious and aware of the business. Anyone that has actually run a successful business with employees has experienced this. You’re not your own boss, you’re a slave of your customers with responsibilities, decisions, and must live with the consequences of making mistakes. It really sucks unless you’re super lucky in the world, and a really shitty person if you want to make it profitable by hurting people and being unethical.