Is this some type of business strategy that I'm not understanding?

For as long as I can remember, I have always liked to play “classic” games on the computer. Sites or programs that offer things like solitaire, spades, those balloon popping type games, etc.
I have noticed that when the weekly scores reset, it’s really difficult to get a normal or high score. It isn’t just me, either. I notice that I can win tournaments at the beginning of the “new” week with a very low score, because everyone else seems to have low scores, too. I’m positive that it isn’t confirmation bias, it is definitely a pattern I’ve seen for a long time. Most recently, I use the Games app on Facebook, but I remember noticing a similar phenomenon on other game sites in the past.

So, is this some type of business strategy? Maybe it keeps things challenging, in hopes of encouraging people to come back?