I could see it for things like electronics projects where the firmware gets modified as a form of configuration. You might want to give out or sell customized

I could see it for things like electronics projects where the firmware gets modified as a form of configuration. You might want to give out or sell customized devices, adapted to the specific user or deployment. The end user typically only wants the binary, so distributing the source is at best a good-faith-waste-of-time and at worst an opportunity to cause support problems. The example I'm thinking of is keyboards running QMK firmware-- it's literally customized by editing a bunch of C and recompiling.