I'm going to be the devil's advocate and repeat that I don't see anything wrong as such with DDs. Puppy farms can breed anything, not just mixed breeds.
If the breeder is responsible and does health checks, etc. I don't have anything against them crossing breeds.
But I know you will all come up with a zillion arguments to prove my ignorance.
And I agree with BL that there is an opportunity in there to promote responsible ownership, inlcuding making sure you do not buy from puppy farms or pet shops.