There's no cost to download or play - what's the incentive to play a clone? Especially when all your friends are playing the real one.
The funny thing I noticed when I played the free version previously is that the developer actually manages to tell a story during the game and has little bits of humour in it. These things make a difference.
(The storyline includes traveling around the world playing competitively and when you return your waste basket is covered in country flag stickers. Then there's the audio feedback when you throw paper outside the screen.)
Intrigued to see another tech company based in Boulder. I spent some time visiting a client there a few months ago. Seems like there's quite the tech community growing there.