I came across this real dodgy modification.

This plug board came in for recycling. The original cord has been replaced with one that has no earth. Also, the replacement cable is the older two core type without an outer sheath.

This is really unsafe.  There is no earthing on the sockets.  If something that wasn’t double insulated was plugged in that had leakage from phase to the metal you can get a belt off it and possibly get electrocuted.

The lesson here is: Don’t modify something unless you know what you are doing.