Could be that for sure - like I game a bit every day, but if I was doing this same project, all of my screenshots from the past three weeks would have been from Crash Bandicoot 4 - and the three weeks before that would all be from Tony Hawk’s Pro Skater 1+2. I basically just beat a level a day. If other people were chiming in every day maybe I’d mix it up.
It could also be self-selection bias - like, I would never do a project like this because I know it would be super repetitive. Maybe they were willing to do it because they already played a hyper-varied selection?