Hybridization just for the purpose of producing "different" offspring for commercial gain is an irresponsible act at best, destructive at worst. It is a problem that has taken on a moral aspect as well.
I'm not sure that anything at all can be done to prevent it legally. People hybridize many different animals and plants for many different purposes. I'm not sure exactly why it seems so much worse to hybridize snakes, but it does...to me anyway.
For some reason, Mankind seems never to be satisfied with what nature gives him and always wants to alter it to suit his tastes. We don't like the way the landscape looks, so we rip it up and change it. We don't like the way Broccoli tastes, so we hybridize it with Cauliflower. We get bored with "plain old" milksnakes, so we cross them with Corn Snakes and called the offspring "Jurassic" Milksnakes, or some such garbage as that. We tend to "play God" a lot. We do this to amuse and appease ourselves, the animal's welfare is never a consideration.
I have seen, from time to time, a person or two poke his head in here and the Pit Forum and start a thread on this subject. That thread always turns into a flame war. The anti-hybrid camp attacks, the pro-hybrid clan counter-attacks and the fight is on. I have never, ever seen the "pro-hybrid" camp present even one biologically or ethically sound reason for hybridizing. They can't present what they don't have. It always comes down to basically "It's my snakes and I have a right to do what I want with them."
To me, one of the only really valid reasons for having a Threatened or Endangered animal in captivity is to try to propagate that animal in it's pure form in captivity so that one day we may be able to help to preserve the wild populations, especially in cases where the animal is endangered in the wild largely by man's encroachment on it's habitat. When the captive gene pool is polluted by hybridizing, that becomes an impossibility. At that point, we have done nothing more than to contribute once more to the animal's demise.
Hybridizing is not legally wrong, but it is definitely morally wrong and biologically wrong. Unfortunately (in this case anyway) you can't legislate morality. The only thing we can do is to continue to voice our opinions and hope some of them finally listen, and protect our own bloodlines.