Yes, but same general idea. It's 100GB, not 100Gb. Compared to terrestrial based networks it's not much - very easy to do far more than 100GB/mo with a land based WISP that offers last mile connections of 15 Mbps down x 6 Mbps up.
The oversubscription for consumer grade VSAT services is an economic necessity, based on the fact that with current technology and launch costs, it's a $150 to $200 million project to build and launch a new 5000-6000 kilogram high powered satellite into geostationary orbit. It will have an estimated 15 year usable lifespan.
https://www.exede.com/plan-results/gold50/