Maybe I should have just gone to a couple of other shops?
You had no problem, but you had to retain physical access to the key for long enough to get it to the store and back.
With this service, that requirement goes away.
I'm not saying it was impossible before, but this makes abuse a whole lot easier and potentially much more widespread.
And the one time I was trying to copy a key which Home Depot didn't have blanks for, it said "DO NOT COPY" on it, and the locksmith I went to only asked me to fill out a slip of paper with my name, the address the key was for, and the type of location it was for (house, garage, etc).
I filled it out with entirely incorrect information.
This service really does not open up many doors that were not already open.