"an individual rendering personal service to the United States similar to the service of a civil officer or employee of the United States, without pay or for nominal pay, when a statute authorizes the acceptance or use of the service, or authorizes payment of travel or other expenses of the individual"
Private businesses scrape the supplied data from government websites and redistributed it for profit making purposes. E.g. Homefacts.com. Community members no longer must drive to the courthouse or fund private investigations. Law enforcement uses the data for crime prevention, detection and prosecution. Supplying data and the data itself therefore posses far reaching economic value.