The weekend event is very problematic.. There's a significant amount of good players with overwhelmingly specialized decks that only play during these times, so it's not uncommon for casual F2Ps to climb the ranked ladder more than they are capable of sustaining and end up being demolished each weekend, thus being unable to get more cards sufficiently to specialize their decks themselves. Even when I ran the gauntlet I still climbed ranks unhealthily. I personally get a 70-80% winrate on weekdays, and a 20% winrate on weekends—the issue is very blatant. 
Some people work during the week ;)
Everyone has something to do, students and employees alike. Literally everyone. We just manage our time differently. — At its core, GU is still a competitive game even if you strip its play-to-earn model off of it, and competitive games need to uphold their competitive integrity for longevity. Surely you have better insight than this. ;)