[malkia]

"Mac App Store is basically a copy of what many popular Linux distributions such as Ubuntu have had to offer for years."

There is MacPorts, Fink, homebrew and probably other systems that are like Ubunutu's apt, deb, and other linuxes rpm (and other) systems.

What's the point?

Also as other people have mentioned there is Steam on Windows, Impulse, used to be GameTap, and lots of other digital download stores.