The Japanese really love their gacha games. I guess it must be because the Japanese were already heavy gamers, but working around the clock doesn't leave much time for games, yet builds up very tedious stress. They can play gacha on their phones wherever they are, during their commute for example, to get a little bit of thrill, quick. Whoever first introduced mobile game gacha in Japan, there must have been some before FGO, probably didn't anticipate what kind of mother of all mother lodes they happened to excavate. Or maybe they did.