And all you are ignoring a tricky issue: copyright.
I can mind how Nutaku or DMM could shift from cash milker to gangsta copyright troll (as did Perfect 10 or Malibu Media)
https://torrentfreak.com/game-makers...irates-151011/
https://torrentfreak.com/judge-slams...y-case-150915/
And i can put more issues on the table (like the Transpacific agreement, it will mean bye to DMM server), but i see too hard to put a private server without any issue, even remaking the content (unless DMM got tired of Nutaku and choose to license other partners).
Give one F2P game to a Korean: He will turn it in a P2W (pay to win)
Give one F2P to an American: He will turn it in a P2F (Pay to fail)
Nutaku ID: 454836