How? Xbox increased more, and first. And Xbox always did poorly in Japan.
If anyone doesn’t know the history, I think it was NEC, was a big electronics company in Japan that tried to make computers that competed with Windows 95 (because they ran something else, I forgot which) and they got their asses handed to them. So the Japanese have been salty toward Microsoft since then. The grudge has started to fade a bit, but it was still going strong at the start of the Series X|S generation (2020). The problem is twofold: Japanese developers won’t make games for Xbox, only Nintendo and/or PlayStation. And two, gamers aren’t buying Xbox in Japan.
I wonder if Xbox went up at all in Japan. It never moved much there. I wonder if they even bothered installing GamePass CDNs there. I wouldn’t.
Also worth noting, a lot of gamers/power user types in the west have been turning against Microsoft for issues with Windows 11 and Copilot. I got tired of their shit years ago and went to Mac for computers, but I still game on an Xbox Series X.
I do like seeing PlayStation get taken down a peg, because for all Microsoft’s issues, PlayStation has always been more anti-consumer. Trophies exist on PlayStation because Achievements were so popular on Xbox that PlayStation (and Steam) were practically forced to adopt them. Xbox has pushed for cross-play and PlayStation has always rejected it. Backwards compatibility is what the PS2 was known for, and the PS3 did it at first, but since then, they haven’t been as good, whereas Xbox has been great about backwards compatibility. Not perfect but great.