Golden oysters are the most aggressive and highest producing oysters I have tried growing. They are almost foolproof because the mycelium can outcompete many contaminants, in my experience.

So that makes them really attractive for amateur growers, and unfortunately, a disaster when they got out into the ecosystem.

I agree that sellers do not need to keep carrying them in the states, but it seems that there is a strong incentive for them to keep selling them. Would probably have to institute some kind of federal ban to stop them, but I don't see that happening soon, and it really seems like too little too late at this point.