“Until Norton decides to turn it on remotely and use your machine for their purposes.”
Exactly, you are handing them control of your machine. I do not miss needing services like Norton one bit since going to Linux. :)
I recently bought a brand new Dell laptop. It came with Windows on it. I booted it up into windows once just to ensure the hardware wasn't DOA. Then within 30 min of unboxing it I had wiped it's SSD and installed Manjaro on it. I'm using it now to type this.