It's more about motivation\objective.

CMIIW, most open source developments start for the following reasons:
- Scratch their own (individual or collective) itch.
- Compete against commercial offerings that are deemed too: dominant, important, monopolistic or 'bad\evil'.

Whereas a commercial development are there to fill a certain users' needs (demand). They have to identify this for them to properly monetize it.

So this is what I meant by the prior 'user driven' comment.