A hint is in how they go out of their way to reassure the reader that no new hardware needs to be installed on the aircraft to support this. The actual answer, though, is down in the "Impact" section:
> Customers who operate an aircraft or an aircraft fleet and are looking to be compliant with the mandatory FAA/ICAO/EASA flight tracking requirements, can do so now with our space based ADS-B constellation network and tracking their fleets under RadarBox.com Business accounts.
i.e. airlines (by law) need to constantly know where their planes are, especially when something goes wrong, and they pay companies like this to do the tracking.
> Customers who operate an aircraft or an aircraft fleet and are looking to be compliant with the mandatory FAA/ICAO/EASA flight tracking requirements, can do so now with our space based ADS-B constellation network and tracking their fleets under RadarBox.com Business accounts.
i.e. airlines (by law) need to constantly know where their planes are, especially when something goes wrong, and they pay companies like this to do the tracking.