They may work as advertised, but the problem is that the cables themselves have no indication of what was advertised in the first place.

The ability to know what the cable you’re holding can do is just not there. Unless you have some way of ensuring that all your cables are the same, you need to:

- discard/donate every cable that you can’t identify (as @brookst did) by its eMarker (though they’re required by spec) unless you own a specialized USB-C voltmeter or multimeter

- manually label every cable with all its unique specifications, either after running it through an eMarker reader or immediately after taking it out of the box