To be honest, if I had an animal that I felt needed to go to a "pet home only" - i.e. it was NEVER to be bred under any circumstances - then I have one of three choices.
1. Keep the animal myself, for the rest of its life, where I can ensure this will be the case. This was my choice with Lesuth, a leopard gecko who became egg-bound; I will not risk her life or allow someone else to risk her life by breeding her, and I cannot trust that someone who took her on wouldn't try breeding because she's chunky, healthy-looking and attractive (and nearly a decade old now... not bad for a lizard one vet told me we might as well put to sleep straight away because there was no hope).
2. Rehome to someone I know personally and can trust explicitly. This was my choice with Piglet, a royal who hatched with a curled tail. It is curled enough that Piglet could not even be sexed - I suspect he's male, but it's a moot point. He was rehomed with someone who understood exactly what they were taking on.
3. If it's so bad that I can't trust someone I know well - and I can't provide adequate care for it myself.... then it will be humanely euthanised.
So I'd never post a general "for pet home only" post... because anything that I don't think should be in the breeding population won't be offered on the classifieds at all.