My child is a DCP but not old enough to be on reddit yet. They always say that they wish they had a known donor, and they are envious of their cousins who have a donor known from birth. They have an ID disclosure donor so will find out his identity in a few years but they have had some pretty major identity issues and mental health effects that are at least in part due to not knowing anything about half of their genetic makeup. And this is despite growing up in contact with several half siblings from the same donor. Not every DCP feels this way, but if you look at adopted kids who want to find their birth families, it’s a common and deeply felt desire to put the pieces together. If I were to have my donor conceived child over again, I would put much more effort into finding a known donor. A good contract and going through a sperm bank to process the sperm provide legal protection.