I'm guessing that Nutaku owns the user data (or at the very least, the authentication key that links a given user to an account), and they're refusing to share it with DMM. After all, why would you give up your sole leverage in negotiations over a thriving income source?

Also, I checked the DMM version and the translation is the same as the Nutaku version, i.e., the censored text suggesting coerced sex is still censored.