I understand something like one of these sites was used by UK police to narrow down a suspect (they submitted the DNA and received a close match by someone distantly related - which gave them the surname)
and I believe 15 year old who searched for his paternal fathers name (he was adopted -the father anonymously donated sperm) but he knew the University where his father went and so when he sent in his DNA test and got a surname - it was a matter of searching University attendance records ..
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sj