It reminds me of the USB keyboard extender that came with old Macs. There’s a little notch in the socket so you can only use it with Apple keyboards. At the time I thought it was a petty way of preventing you from using it with any other device, but apparently the reason they didn’t want you to use it with other devices is because the cable didn’t comply with the USB spec.

Some pictures here: https://www.reddit.com/r/assholedesign/comments/b1u08k/this_...