What do I know. One of the ancestor comments introduced the concept: "They aren't philanthropists, they are just (grudgingly) abiding by the license of the software they are building on."
As an attempt to answer: They can just satisfy the letter of the GPL by a code dump--which I would count as grudgingly, or they can embrace open development.
As an attempt to answer: They can just satisfy the letter of the GPL by a code dump--which I would count as grudgingly, or they can embrace open development.