Which of the following is NOT an indicator of successful service adoption?

High user engagement and satisfaction, steady usage rates of the service, and positive user feedback are all clear indicators of successful service adoption. When users are engaged and satisfied, it generally indicates that they find value in the service and are likely to continue using it. Similarly, steady usage rates suggest that the service is being utilized consistently, which often reflects a successful integration into the users' routines.

In contrast, increased support requests and complaints typically signify challenges with the service. While some level of support requests can be expected as users learn and adapt to a new service, a significant increase may indicate that users are experiencing difficulties or that the service may not be meeting their needs effectively. This can detract from the overall perception of success in terms of service adoption, as it highlights potential areas for improvement rather than demonstrating that users are successfully leveraging the service. Therefore, this choice rightly represents an indicator that does not align with successful service adoption.