Honestly, I don't think someone can get that bent out of shape if they make seeds publicly available for sale. If there is something you don't want to be shared or used in projects and are not going to personally vet every possible customer, it's best to not release it. I know there was a grower from the other forum bragging about plans to hit a Chem with a male from his pack of Super Skunk. So either the seed seller didn't make his wishes known, or his vetting process isn't airtight.
With that said, I honor any wishes/restrictions on genetics as an adherent to the Golden Rule. I have cuts from guys that came with no share restrictions and even in the case of a falling out with a guy, I will still never let that cut escape my library.