Comment by pjc50

I'm not sure that software entirely obeys normal market theory. So much of it is zero-cost free.

The synergistic effects are so strong that most users would prefer there to be The System, in which everything works together and there's no risk of incompatible choices. They don't necessarily care which system.

The market in things like, say, file explorers is tiny. There's a few shell replacements (free), Midnight Commander and clones, and maybe over in the corner someone making a few thousand dollars a year from an Explorer replacement.