This predicament isn’t really unique to online dating though. Lots of society throughout history have had polygamy (elite men get many wives, others are shit out of luck).
I’ve been wondering if war mongers in times past have been driven by this—decimate men to rebalance the scales towards the general male population (and also the elites who don’t fight).
There were baby booms after the two world wars. How much of that was due to a perceived scarcity of men among women? Did that cause them to settle quickly?