I don't think even the non-3d printed commercial ones are for law enforcement purposes.

Besides being for fun, the main draw seems to be that it picks the lock _and_ gives you the bitting. So if you lose all your keys, your locksmith is now in and can easily remake keys without swapping out the lock core.

There may be cases were it's (much) cheaper to pay a locksmith to stand there for ten minutes and spend a few minutes at a key machine, rather than pick a lock in 30 seconds and spend 10 minutes installing a $100 high end lock cylinder.