Ask HN: Open Source Horror Stories

Hello.

We know positive success stories about people open sourcing their product.

I would be very interested in finding counter examples.

Who had regrets afterwards? Any horror stories?

Background: I would like to convince my investor and myself that we should free the core of our application and have an additional commercial license. The application is mostly targeted at bigger enterprise level customers and I do not see that the people who have commercial licenses, would even consider to go with the free version. But I might be wrong.

Thanks for your time.