Yes. For the commercial DC lighting installations I've seen they were using power over ethernet. That's not necessarily the only way to deliver DC power but whatever you do it's going to be wired differently from 120 VAC.

I used to do electrical installs in commercial buildings and this was starting to catch on, mainly because the the practice of running ethernet (including the 8P8C aka RJ45 connector, patch paneling, etc) is already established. This always felt very roundabout and requires expensive networking equipment just to run lights which I do not personally like because it will just cause confusion.

You also get (the wiring for) remote control for free though, which is nice.

It seems like there would be a market for cheap as possible 10 mbit switches with 802.3bt/802.3af support though.

https://www.amazon.com/Gigabit-802-3af-100Mbps-250Meter-Unma... is pretty cheap as is, I'm sure you could buy something in bulk for cheaper.