The definition of employment is trading some kind of value (usually knowledge, skill and labor) for money. When you work for a company, you are doing that trade with your employer, who in turn resells your services to their customers, while taking a cut of the profits. In effect, your employer is a middleman providing a degree of stability, security and pretty much instant ability to sell your services, in return for making a profit off your work. By being a startup owner/founder, you are doing essentially the same thing, except that now your boss is your customer. You still answer to somebody. As long as you want to sell something to the world, you will always have a 'boss'.
I don't see what's so wrong with working for another person. So what if it makes them richer, is that a bad thing? It also makes you richer, so equating it with "dealing with the devil" is just immature.