That's because Nukaku is not "running" it much. They only provide hosting & billing platform (and stated it numerous times before when people complained about "Nutaku is killing/pulling games").
Its run by "gaijin department of DMM" (most likely about 3 persons with some knowledge of English), which was set up as DMM saw opportunity to syphon a bit of money from overseas market. Thats them "kamihime_nutaku" on Twitter. But that's department is not a priority for them, never been, and they only run western-oriented games as long as they can balance super economical support cost (basically copying JPN content), some resource used on doing gar(b)age quick & cheap translation and covering this with mediocre revenues from Western scroungers (at least comparing to native otaku crowds). If revenue can't cover even ultra-cost saved resource - game given instant kaput.
Nutaku does not care because they will get their cut on hosting in any case, successful game or not.