[kmeisthax]

A USB-C port that only supports USB2 data and power only needs a few resistors across some pins to trigger legacy modes and disable high current/voltage operation. All the extra bits are the things that jack up the cost.

USB3 and altmodes require extra signal lines and tolerances in the cable.

High-voltage/current requires PD negotiation (over the CC pins AFAIK)

Data and power role swaps require muxes and dual-role controllers.

That's all the stuff that makes USB-C a pain in the ass, and it's all the sort of thing RPi Nanos don't support.