> but if you want to build on top of ours, you have to give back No! Nowhere does the GPL says you have to give back to developers, you just have to give every

> but if you want to build on top of ours, you have to give back No! Nowhere does the GPL says you have to give back to developers, you just have to give everything to the users (and more specifically to your users), because they are the one with the product and the modifications. If they happen to be upstream developers, then sure, they will get the changes too, but that is not the primary goal of the license. It's all about the user being Libre.