A lot of people talking about how displaying the flag at all could get somebody in Russia in trouble. You could see the increasing of the likelihood as helpful then, because the flag could always appear. By making it come up more often it communicates to the user that it can appear it gives a chance to the user to notice it in a "safe" situation and not use xsnow if they are in a situation where it could cause trouble for them. The existence of the flag is not quite mentioned at https://www.ratrabbit.nl/ratrabbit/xsnow/, and the site is loading too slow to see if it is shown in https://www.ratrabbit.nl/ratrabbit/xsnow/visuals/index.html.