I don't like this assumption of copying. I've been writing multiplayer tron-like games as a "hello-world" style programming exercise for 20 years now and have done numerous variations including curves, and wiimotes and the like. I don't think there's sufficient novel content in curvefever (well executed as it is) to really be accusing anyone of shamelessly copying it.
Yea, but this one has more similarities than just being another tron-like game: all the items that can be picked up is the same, the ability to add local player and the arrow that marks you at the start is the same. It's not a big deal since it's free and open-source.