5A is the max rating for USB-C. What you're looking at is probably a 5A cable with a "10A" molded into the connector in true sketchy knockoff fashion.
To answer OP, USB-C connectors are often used outside of phones/tablets like with hobby electronics like boards to control LED strips that could benefit from more current. Unless this cable is super thick, there's little chance it can actually handle 10A and even if it can, the connectors aren't rated for that much current.
Yeah damn those sneaky Chinese, forcing Western capitalists at gunpoint to buy their fraudulent goods en masse for markup and resale to Western markets. If I wanted shitty manufacturing, I would have bought American and saved us all some carbon!