It would be WAY too easy for DIY'ers to seriously abuse/misuse the application of it.
That holds true for almost everything electrical-related that I've seen either directly or courtesy of this forum.
NM cable being connected to male and female cord-caps to make extension cords.
Handi-boxes being used as portable cordsets.
Circuit breakers with tie-wraps shoved into them.
Fuse-holders bridged with tin-foil, a piece of 12AWG wire. Screw-plug holders with slugs.
Extension cords being passed through holes in the wall or roof and wrapped on trees.
"Repaired" paper-lined metal-shell lampholders that have had the interior mechanism wrapped in
MASKING TAPE because the original cardboard shell rotted away (I still have it around here somewhere).
The list goes on.
Also, keep in mind any DIY-er can buy from an electical supply house.