Looking at the comments I see that almost no one understand the business structure here.
Blaming Nutaku? They are only giving a platform for other people to post their game, they can't make other people continue developing the game.
Blaming DMM? They are only another platform that post similar games, the contract most probably is not with them, but with developers.
Blaming Devs? They need to earn enough money to be able to afford extra resources dedicated to translation of the game into English and to support an outdated version. If they earn less money than they spend on this, it's obvious why they need to close the game.
I say, the players are to blame. Some did pay some money, but most played the game for free and that's why the game was not profitable and devs had to stop it to cut their losses. And now players are blaming everyone else but themself.