Yes, D4DJ Groovy Mix(グルミク) may collect personal data for account management and to enhance user experience, but it adheres to privacy policies to protect user information.

D4DJ Groovy Mix(グルミク) requires an internet connection to access most features, including downloading new songs and participating in events, so it does not fully support offline use.

To cancel your subscription, go to your device's app store settings, find your subscriptions, and follow the prompts to cancel D4DJ Groovy Mix(グルミク) subscription.

The subscription costs may vary based on the content or features offered, and users should check the app for the most current pricing information.