See gemini://bbs.geminispace.org/u/stack/23176 for some other notes about USB, including some notes about charging with USB-C, and about the regulations in EU.
TL;DR — short blog post where the author complains that USB-C cables are not equivalent. No technical information or dive whatsoever, and nothing about EU regulations.
Definitely wasn't worth figuring out how to access gemini://.
