> There also is the fact that a large amount of FLOSS is an exercise in resume building (FLOSS contributions is SWE resume building 101)

Not all of it. Plus, we could say the same thing about the typical worker at the average modern company. Google's product graveyard is a popular example of this. Resume padding, job hopping and ladder climbing are the norm now. In that respect, I can see why you're so pessimistic about the average human.

Much of the dedication often found in modern FLOSS is reminiscent of how companies used to operate: valued employees actually believed in the shared mission they were all striving for, and they took pride in their work as a result.