Exactly. I don't know where the phrase "contribute to the community" came from but it's not in the GPL license text. All you have to do to comply is make your

Exactly. I don't know where the phrase "contribute to the community" came from but it's not in the GPL license text. All you have to do to comply is make your own source code available on request to users who accept your license, along with installation instructions to build the running product. That's not contributing anything to the other dev's community.