I will disagree with a lot of this. First, a wild culture that is captured is not intellectual property. Second, requiring you to agree to not cultivate a first generation cultivar MAY be legal and ethical, but after that, it is no longer the product you bought, it is a commingling of what you bought and what you introduced.
This differs from intellectual property in that if you buy software and improve upon it (commingle), then you are still legally and ethically bound to not sell it in that the original patented/copyrighted code is still an integral part of the item. This is not so with "wild" code, that could be considered to be open source code. An example would be the commercial versions of Linux.
If you were to buy and dry the Ischa starter from a seller, then resell that culture, you would be in violation of their terms and conditions. If you were to buy and grow the culture, then dry and resell it from the first generation, you may be (very narrowly) violating the terms and conditions (and ethics), but after that you are selling a unique, un-patented, non copyrighted mixture of a specific (Ischia) and local yeast and bacteria culture.
From my reading, it is not really the yeast anyway, it is the symbiotic bacteria that distinguish the culture.