They should at least be called what they are. A sexlink or Marans Hybrid.Like I said for a backyard flock it's fine. They are nice looking birds for sure.
I am raising 6 feedstore chicks now that were simply labeled Marans. They very much looked like BCM chicks, but I do not know that they are not some of the hybrids?? I bought them to add some brown egg layers to my flock. If they lay dark brown all the better. But for me it does not matter because I only breed for my personal flock.
Chickens are not like dogs and cats. They do not have a registered pedigree. It's sad some people will take advantage of that to make a dollar.