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Most people don't use Ubuntu.

Come on, man, it's a Linux Distro – how many of our moms are installing those?

Plus there's the whole easy monetization thing for developers.

This is like saying Dropbox's functionality was a solved problem thanks to rsync.

Sure it's gaming-specific, but more prior art: http://steampowered.com

It's one click and a password to buy from the Mac App Store whereas Steam takes five clicks and no password (if you have it set to remember).

Apple's store is no revolution in my book, far from it, but at least they put that Amazon One-click patent to good use and made the process easy.