Not sure I take your meaning.
Virgin Galactic and SpaceX are certainly aerospace companies. Space exploration isn't really a goal, more like space exploitation and development. NASA itself is not space exploration company persay either. They are quite diverse in aerospace, general science development and research, and space exploration being the more publicly visible initiatives.They contract to aerospace companies for their equipment. Only difference being that they are government funded and have to follow government bidding contract rules.
NASA has hired SpaceX on two occasions to deliver supplies to the International Space Station.
Virgin Galactic is more about space tourism.
Not sure what satellites you've heard about being hacked, but that is nearly impossible without inside knowledge, not to mention the equipment. Not sure what you mean by powerful machines. Space hardened equipment is usually low power and slow. If you are talking about capabilities, there are hundreds of media satellites out there that just re-direct data. More or less giant routers with big antennae.
No different from Hughes Net which has been around for decades supplying remote locations with satellite internet capability.