The CCK isn’t just a lightning to usb 3.0 converter, though. If you need to connect your existing usb hub to your new MacBook use a usb c to usb 3.0 converter like this: https://www.amazon.com/dp/B07449RJV8/ref=cm_sw_r_cp_api_fabt1_WCxXFbSRC5QJR?_encoding=UTF8&psc=1

Or just get a new usb hub that has usb c connectivity.

The CCK is used to turn an iPad or an iPhone into a usb host that can take incoming signals from usb peripherals like a camera or an audio interface. Using it as a usb c adapter on a MacBook will certainly have some unintended consequences, like your aggregate devices not working properly.