Probably just for fun, although I thought the same too, I tried picking a few different teams to see if it did anything, but it just displayed the flag.
Maybe there's some kind of competition involved.
Somebody asked them to put a theme on there for the world cup, and whatever country you support, you pick it and when the bot runs you get a wonderful flag of your choice on the screen.
It is aimed for fun, but somehow, I find it annoying
No, theres no competition, just for fun.