What if the gov puts in place a simple regulation, like “X% of all harvested blood must be donated to local blood banks”. Now you have a market for rejuvenating blood, AND more blood available to hospitals. Only downside is an increase in price for Peter Thiel.
I’ve noticed taking such a moral stance tends to limit creative thinking around such topics (why spend time thinking about it when you’ve already dismissed it as immoral?). A bit of creative problem solving can sometimes turn a potentially problematic situation into a net positive for everyone.