(a) A fuse only prevents over-current based on the port's rating, not the cable's. It wouldn't help here. (b) USB-C has several modes of operation. The thinner

(a) A fuse only prevents over-current based on the port's rating, not the cable's. It wouldn't help here. (b) USB-C has several modes of operation. The thinner cables aren't under-speced in the lower-tier modes. They're perfectly fine for powering a mouse or carrying low-speed (USB 2.0 class) data. But not for charging a laptop, or other high current / data-rate uses.