The issue isn't getting a puppy from a responsible breeder. Generally, if you want a purebred puppy that's where you should go. I worked at a shelter for many years, and we suggested people to go to responsible breeders all the time.
I actually meant those specific photos are puppy mill puppies. They're clearly from the same website. A responsible breeder won't have 5+ breeds for sale. And if those are photos from a pet store, they are also puppy mill puppies.
There's a big difference between getting a puppy from a responsible breeder vs getting one from a puppy mill. Even a backyard breeder that at least only raises 1 litter at a time is better than a puppy mill.
I've owned/operated a pet sitting/dog walking company for over 19 years and so I've seen literally hundreds of new pets come into families as puppies and rescues. I volunteer as a dog walker at our local ASPCA when my schedule allows and pet rescues are the largest line item in our "giving" budget. I say all of that just to point out that this is kind of my wheelhouse...at least with respect to my passion and what I do for a living.
And I do believe, as you do, that there are terrible puppy mills out there that are just churning out puppies of all breeds to sell on the internet. However, there are also *plenty* of AKC approved breeders that are churning out tons and tons of puppies....with the necessary health checks, etc....that just happen to focus on one breed. Often, the females aren't living in the household with the family, but in more of a kennel situation. The dogs spend lots of time away from the family with the trainers and handlers on the road....in crates, being groomed endlessly....etc....in order to get points towards becoming "champions". So, the parents of those puppies aren't always living an ideal life either.
I try not to judge how people end up with their pets. Most people decide that they want to get a puppy, and they get one as soon as they possibly can, not getting on wait lists which would be the standard if you're purchasing from a true "reputable breeder"....because their puppies are usually spoken for long before the birth. The other obvious issue with rescuing is that many shelters are filled with pitties and they aren't always a good fit for every family. Some rental units and HOAs won't even allow them. I usually try to steer people toward a local rescue organization the specializes in a breed that they are interested in to see if there may be a good fit. If they end up purchasing a puppy, then so be it. As long as the puppy/dog is well cared for and loved, that's all that matters. Anyway, just my 2 cents.