companies are stealing and selling *explicitly licensed as non-commercial* open-source emulator code, obviously against the will of the authors (copyright owners of the software), sometimes spitting in their faces and mocking them for being so foolish as to contribute to the commons and have their wishes respected.
https://www.libretro.com/index.php/appeal-to-game-journalists-about-retro-bit-and-about-the-new-retro-emulation-industry-in-general/