It all depends on where you want to place your ethical bar.
The lowest point is where a person would look at keeping any type of wild animal in a plastic or glass box unethical.
There is always a person with a different view. Who's to say one view is better over the other?
I think there is enough room in the hobby for everyone. I think it becomes unethical if and when a breeder tries to sell a cross, hybrid, mutt as something it wasn't. That's when it hurts the hobby. Even a pure bloodline can get mislabeled somewhere down the line of owners.
When you start pointing fingers and start saying things shouldn't be done, be ready for the people to start telling you their opinions. There are huge groups out there that think it's unethical to have pets in the first place.
I'm all for hybrids, mutts, morphs, pure bloodlines. I have animals sitting in plastic for my enjoyment and might even make money off of them one day. I'm in no position to judge a person If they want to cross A with B.
Is it important that we keep pure bloodlines? Yes!
Are those pure bloodlines kept in captivity on the same path as the wild animal? No! So in a way that pet, money maker, project has already been changed.
How many wild caught animals have died from the stress of shipping just so we can own a life? In a way we are all a bit guilty of being unethical.
There is room for all of us. We should all work together and make sure we always have the right to enjoy our hobby.