I'm not going to look at your links—I just want to know how you define "self-sufficiency" or how you expect people to get rich without someone else's money or labor.
Any job you have, you're getting paid. That's the company's money, and before it, the customers' or investors' money. If you work hard—getting an education to get a high-paying job, working hard at your job to stay there or move to better positions, and investing your time and money wisely—you can get rich.
You can also get rich if you start and maintain your own company, and that's going to require getting someone to pay