Roughly, look at any mobile software you use and look at the open source licenses. Note how much of that code gets pushed back into the rest of the world. For e

Roughly, look at any mobile software you use and look at the open source licenses. Note how much of that code gets pushed back into the rest of the world. For even more excitement, look at major non-tech companies and see how much they contribute back. In my idle memories, I think Walmart might be the only one I've personally seen... The GPL (or its stronger and younger sibling, the AGPL), contractually require release of source to the user.