>>717482126 (OP)
They have unimaginable population density where huge percentages of their male-lopsided populations live in apartments smaller than your bathroom and they never leave them because the city outside is smog ridden and ugly and the escalators eat people. This subset of the population basically depends vidya and such for any degree of happiness and thus provide an extremely useful testing ground for gachashit.
https://youtu.be/Xv__gquQq2M
It's largely the same reason koreans got so good at starcraft.