I'm not sure this is true. Proprietary source code gets leaked and that can be used to train a NN. I find it likely that Copilot was trained against at least on

I'm not sure this is true. Proprietary source code gets leaked and that can be used to train a NN. I find it likely that Copilot was trained against at least one non-OSS code base hosted on GitHub. Second, if copyright is being laundered away we can get increasingly clever with how we liberate proprietary software. Today, decompiling and reverse engineering is a labor intensive process. That's the whole point of "open source" - that working in source is easier than working in bytecode. Given the hockey-stick of innovation happening in AI right now, I'd be surprised if we don't see AI assisted disassembly happening in the next decade. If you can go from bytecode to source code, that unlocks a lot. Even more so if you can go from bytecode to source code and feed that into a NN to liberate the code from its original license.