The main reason Korea Maplestory is more popular than Global Maplestory

Isn't JMS hemorrhaging money?

 Quarterly Earnings Q2

(a) Japan
Revenues for the six months ended June 30, 2018 amounted to ¥4,581 million (down 30.6% year-over-year),
and segment loss amounted to ¥3,774 million (segment loss of ¥1,851 million for the six months ended June 30,
2017). In Japan, both PC online and mobile game revenues decreased.
http://pdf.irpocket.com/C3659/N9qg/GQh9/IwK5.pdf

I don't believe there are many players in JMS left but I haven't got anything but speculation and rarely see any JMS youtube videos.

Hackers still exist in all regions of the game, even KMS.

Far less hackers in KMS make a significant diferent game, they problably have 100 times less impact than in GMS/EMS/Msea, problably what make the game a lot better is the lack of hackers and dupers with a huge impact in the economy and gameplay, even Reboot has it problems even thought it got no trade system.

I gave the exemple of the East as an exemple, but Korea is diferent from China or Japan when comes to gaming and even more Maplestory

I think unlike Korea, Japan doesn't have incentive to the hardcore gamimg aspect, problably helps people play less aside from other aspects i imagine impact more than Maplestory which you showed as well.