Oh goodness, no. I always make sure people know my crosses and that I don't only have pure breeds. The last thing I want is someone to think they're getting something pure from me and use it in a project that requires itI think the issue people would have would be selling the results of the crosses as purebred for either breed. As long as the heritage is fully disclosed to the next breeder, then they can decide if that is what they want to work with. My overarching goal with my GH birds is preservation of the genes I received from Joel. To that end, I feel I should distribute them widely, but my goals do not include outcrossing to other breeds.
I love the hear the results of such breeding and the genetic information gleaned, just do not represent them as pure GH to anyone until you have a stabilized line that has been used by experienced tiers and given a big thumbs up, then they would be your line, no longer the line of the breeder you got them from.