Why isn’t this electrical circuit disabled on the iPad’s Magic Keyboard?

Apple’s website says (in small font):

The USB-C port on Magic Keyboard provides power, but it doesn't transmit data. This means you can't use this port with an input device such as a USB-C mouse. Never connect one end of a USB-C cable to the USB-C port on your iPad and the other end to the USB-C port on your Magic Keyboard.

Naturally, the moment I read this, I had to try it. My battery did jump up from 44% to 45%, but it was an internal battery cycling error since the keyboard itself doesn’t have a battery. The iPad did start to heat up a little, but I’m surprised this function isn’t disabled. It really does give normal people the impression that the keyboard can charge your device, only to drain it faster than usual.

No, not infinite battery life. Notice the charging logo.