What's the intended usage scenario of the Cat5e runs in my new house?

Question

We are buying a new house, and I was curious about this junction box. It has several lines of coax and cat5e in it.
Each room has a blank plate, and behind it is a coax and a cat5e drop.
I was assuming that when we get Comcast,I could put the modem in this closet, with a router and switch, put ends on each Ethernet cable, and have wired connection in most rooms.
But then I looked closer and realized that 6 of the Ethernet cables are wired to 2 other Ethernet cords, using only 2 wires from each cable.
Any ideas as to what this setup is?

Peter Green · Answer

Summarizing what has been said in the comments:
Having the blue pair paralleled between all the cables strongly suggests the builders intent was that they be used for phones. Cat5e cable is often used for phone wiring as it's more interference resistant than regular phone wire and the blue pair is the conventional "first pair" for phone wiring.
As for your options, there are two main ways forward.
Option 1, ditch the phone wiring cut off the builders mess and terminate the cables individually as network cables with all four pairs. This will let you run gigabit networking.
Option 2, leave the phone wiring as it is and use the green and orange pairs of each cable for Ethernet, this will limit you to 100 megabits per second.

What's the intended usage scenario of the Cat5e runs in my new house?

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