Yes these are generally useless, sure we can make a forum in 1kb but why? I can appreciate an elegant piece of code that shows a much better way to preform a task but lets make something really simple and see how small we can do it is pointless.
It's a game. People are having fun. Playing golf is also pretty pointless when you think about it.
Relax, nobody is suggesting this is how you are supposed to write all your code.