Even if we accept the premise, and the conclusion that this equation 'explains the triumph of open source and public domain software', it explains very little about the relative success of open source/public domain work vs. commercial closed source work.
I think history indicates that some commercial works can also triumph.
A faster evolving approach to AI is coming out this year that will smoke anyone who still uses the term "license" in regards to ideas [1].
[0] https://breckyunits.com/eta.html [1] https://breckyunits.com/freedom.html