It actually is a Chinese brand, but not some one-off brand bought off Ali Express. It's a device bought from a reputable store in France with a name that I've seen around for several years (Vaporesso). Sure, that fact, in and of itself, is not enough to guarantee that corners haven't been cut and that the product is actually up to spec.

But, as a random consumer, how am I to know that it's "a pretend USB-C"? It looks exactly the same as my headphones, comes with the exact same-looking cable. There are no markings on it. The usb-c ports on my laptop have a bolt icon next to them, but its usb-c charger doesn't have any marking. They also don't say it shouldn't be used with anything other than the laptop it came with, and actually is able to charge my headphones and my mom's usb-c phone.

Even though I've kinda followed the talks about PD, negotiation, etc. its still not clear to me why this particular combination doesn't work. I was under the impression that, lacking any negotiation, ports should default to the basic 5V 500mA. So my fat laptop charger should be able to at least trickle-charge the e-cig.