Dunno. Millimeters are real.
I remember a quote which says that a good analogy of the housing crisis was "We stopped building because we ran out of millimeters".
[Citation Needed]
Well, if you need a Citation, you probably have done at least something wrong.
The difference is that the code is distributed for free.
Nonsense. The GPL is especially used against finance-driven development. You "pay" by being a human instead of a robotic bean counter. The GPL states other demands than monetary. The GPL exist to fight money based extortions. The damages are damages against humanity. These damages are more real than the dollars you want to express them in.
Old programmers never die, they just hit account block limit.