Under the house

Yesterday I ran a 100 foot ethernet cable under my parents' house, from the room with the router to the room with the main DirecTV box. When the DirecTV installers set everything up they didn't bother with network cables, instead just opting to rely on wi-fi which has not been working out well at all. The box would constantly disconnect from the wi-fi with the only way to get it to reconnect being to press the red reset button on the side of the box, and even when it was connected they had constant problems with on-demand streaming buffering and just flat out stopping. I initially wanted to run the wire through the attic and down into the walls but after I went into the attic it didn't seem to be very feasible. The room with the main DirecTV box was an add-on and doesn't have an attic to speak of, plus the wall it needed to be on was an outside wall which meant even if I could somehow get over to that wall and find a way to drill down into it I'd still have to get through a bunch of insulation. So instead I used the existing hole that was being used by the cable wire and ran it under the house up through the office floor where there used to be another cable wire. I'm pretty sure the cable wire was there before the DirecTV people came so did they cut off the end and push it through the floor? What's the point in that? Like it would never ever be used again at some point in the future?