If they're left on, they should be fine - it's when the device is locked and idle for 7 days that the port is shut down. Also, I'm not familiar with any Kiosk

If they're left on, they should be fine - it's when the device is locked and idle for 7 days that the port is shut down. Also, I'm not familiar with any Kiosk type implementations that use lightning for data xfer except POS devices, and thos would obviously be unlocked whenever they are in use - so again, no issue.