2. You initially sold people on this project. That's what got your project enough eyeballs in the first place for you to even consider making it a business.
3. Of course, your acquaintance will not complain - that's precisely the reason they are still with you. As you got upset when people told you of your unfairness. It's such a pity that these days people don't even have friends who can tell them the truth to their face.
4. OSS as requires a certain spirit. The OSS project is being sold on a set of ideas which is exactly opposite of the commercial world - that's why they use and contribute to your product.
5. Maybe you are too poor to be an open source contributor, I suggest getting a job and not expecting to make money by flipping the board. That will get you more fame and respect.
That said, now playing victim will not help you.