Back around 2012 my company was preparing an embedded system. The day the license was added one of our tester found the section about sending $5 to whatever address to get that source code. He sent the letter with his $5 and it came back return to sender. Even though this was an internal only release (most of the functions weren't even written yet) our lawyers made us go through the entire recall process to replace all the code the testers were working with - to show good faith just in case something more happened.