all over pets for homes,gum tree and Facebook selling are mixed breed cats. They are mostly not back yard breeders
they mostly are.
my cat is a rescue whose kittens were sold on gumtree and facebook. She was kept completely alone in a building, litter after litter. By 18 months she was completely broken so when the last kitten sold the “breeder” said he didn’t want her, and fortunately the kitten purchaser took her to a rescue.
she was so emaciated they were worried she wouldn’t survive being neutered, but she needed doing as the issues from the constant breeding would kill her as well.
when she came to us she was terrified of everything- household noise, us, the dog. It took us a year for her to be in the same room as us, and she preferred to hide in the day and come out only when the house was silent. Two years and now she loves being with us and is always nearby, but is still working up the courage to sit on a lap.
but hey, she’s a pretty cat who produced highly desirable kittens that people wanted because of their colour and coat pattern.
so yes, that is what you’re likely subjecting a queen to buying off facebook.