[CoreXtreme]

1. Dealing with paying customers is actually worse than this. Unless, of course, you have an army of lawyers.

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.