Are you at all involved with purebred dog clubs and/or purebred breeders?
Your post reads as if you are not, and have no idea what we’re talking about. But, perhaps I’m wrong.
My breed club is fewer than 2000 total members in the US and Canada. Not that there are not other breeders, of course, but most (not all) of the long-term reputable breeders are members. Meaning those that have old bloodlines, compete in various dog sports, and are nationally known/recognized for their breeding programs.
It’s a small community. Very small. The pros - I could probably hook you up with a top quality puppy in about 24 hours because I know breeders across the country. The network would work fast. I could probably get you an older puppy or adult, or even started gun dog. For sure I could find you someone who could help you find someone.
The cons - people know people. Yes, there are two sides to every story, but rehoming a dog without contacting the breeder? Almost no excuse for that one. You would be questioned, and unless the breeder is known to be a shitty breeder, the members would pretty much close ranks around them. (As they should.) If you buy from a shitty breeder - that’s on you. You’re kind of an idiot, so you would get different treatment; usually an effort to bring you in and educate you about why you should look for a good breeder next time.
Placing dogs properly in appropriate and vetted homes is not the same as “continued lifetime of control.”