You’re right. I also find it telling that John Sotos doesn’t give a single argument for his recommendation. He simply “proclaims” that you shall not share your genome “without good reason”. He says that everything in life is a cost–benefit balance but that’s an empty phrase. What are the costs in this scenario? I’m not saying they are nil, but they’re probably negligible compared to the benefits you mention, especially considering that theft of genomic material would be trivial for a vested actor. No need for you to share anything willingly.