Not all clients have an available P2P route between them, and require a dedicated TURN server to forward the traffic between them. So there are some ongoing compute costs. But they also put the upfront effort into writing the code, and there is an ongoing maintenance burden. And they're looking for a way to turn a profit on their work.
Awesome! FizzBuzz example in idiomatic Rockstar from the repo:
Midnight takes your heart and your soul
While your heart is as high as your soul
Put your heart without your soul into your heart
Give back your heart
Desire is a lovestruck ladykiller
My world is nothing
Fire is ice
Hate is water
Until my world is Desire,
Build my world up
If Midnight taking my world, Fire is nothing and Midnight taking my world, Hate is nothing
Shout "FizzBuzz!"
Take it to the top
If Midnight taking my world, Fire is nothing
Shout "Fizz!"
Take it to the top
If Midnight taking my world, Hate is nothing
Say "Buzz!"
Take it to the top
Whisper my world
You might be interested in docopt (http://docopt.org/), which is a multi-language command line parser that removes almost all of the boiler plate. Whereas the versions of docopts for Python, etc. just require an import, the C version emits C code to do the parsing. It may be worth a look!
