As an employee, you are essentially a business owner with one customer. Your customer can cut you off at any time with a 3 AM e-mail, even if you pour your heart into your work. You lose access to it too. You own nothing, any thing you do, your customer owns 100%. There is no intellectual property of yours it's all theirs. Owning a business is super hard and you won't make as much money until you sell, if you are lucky to sell. But, being an employee is even more crazy.