Probably a thing that keeps your local fire marshal awake at night.

A vertical, non-fireproof chimney (and that's what 6" PVC is) running
vertical between floors will facilitate the growth of a small fire on
a lower floor into one of catastrophic proportions. Use metal conduit,
and stuff some coarse steel wool into the ends after you have run
the cables. You, you family, and the fire marshal will sleep better.

In this case, it's from the "laundry room" (now equipment room) of a small
2BR house, into the attic of same.

It's a Real Good Thing to even stuff something like steel wool into
overly large holes used to pass smallish cable through sill plates.

Oh yes, among other things, the heat bill would eat me alive otherwise.

There was a time that I put 600 phone lines into a residential
basement in wisconsin.

I think I know the name of that spammer. :-)

Not my site! That site became www.cedar.net
I got the lines put in for free, including running them under a freeway, and
adding a fiber cabinet near the rail line.
Our first web server was a SCO box, where I hacked the help system to
respond on port 80.
That was when web server sw was $10k+