That said, while we do not default our service to timing out after inactivity, if this is something your organization values, you have the ability to control this. These reasons are based on Office's cross OS version compatibility, communications from our users about their Office usage profile, preferences, resource usage profile, and differing ways in utilizing the service between Office and Windows. As for stopping the service, there are several reasons we do not automatically shut down the service by default.
The Office Software Protection Platform service is generally started on demand when a user has started Office, however, there are license types which can start the service otherwise (such as those using a Key Management Server).