We all have different occupations and work for different companies. We work hard and keep improving ourselves to show our company owner how good we are at our work and how efficient we can be in growing the company. But all we are doing is helping grow someone else's companies. All our talent and struggle is to help someone else earn more money. What are we doing for ourselves? At some point in our life, we must grow our own businesses for our own safety.
This is wrong expression. There's absolutely nothing wrong in working for someone and get paid. One can not just wake up and see money to establish his own company. By offering your service to someone does not mean you are helping them to earn more money unless you are doing your service free. Yes, your service may earn them more money as well as earning you money too which you can use to establish your own company someday.
The skills you have is the one earning you money while working for someone else and that's why not everyone is opportune to work everywhere. You may have the skills but not the resources and vice versa. The company owner pay you the resources you don't have while you offer in return the skills he doesn't have. Nobody is loosing.
In short, what you do is a win-win solution if you know for yourself that you have skills that will benefit you and others will also benefit from your service because of the skills that you have. These behaviors are normal, it's the same nowadays, you should take advantage of every skill that you know will be useful to others and charge them for the service you will do.
Even if you go to this time, there are many people doing such services offered in truth. It just depends on how you market your service to your prospective clients.