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The donor is anonymous but their characteristics are heavily marketed. In cases like this one, parents feel like they were intentionally misled: promised one thing and sold something else. I haven't had time to read the full article, but in many cases the decision about which sperm to use is made based on donor characteristics that are considered desirable: height, hair, skin colour, intelligence, lack of self-reported mental conditions, etc. The sperm they are provided tends to be from donors who don't measure up in these areas.

Furthermore, several stories resemble this one where a fertility doctor used his own sperm and that is considered particularly egregious. Not only for the reasons mentioned above, but because doing so is considered lying by omission. There are also notions of fairness with respect to fathering children: don't father too many and fulfill your responsibilities towards the ones you do. Biologically fathering dozens if not hundreds of children and having nothing to do with them afterward is considered unfair to the children, even if they happen to have a real father who raises them.