23andMe agreed to pay $18 million to settle claims over a 2023 data breach affecting 6.9 million users.
And that is before the lawyers take most of it. Basically zero consequences for breach of DNA sequences, health reports, ethnicity, race, location, etc. Fascists surely won’t use this for anything horrific.
Data of just ethnicity or heritage (as in area of family origin) itself already special protected data under EU GDPR, not even allowed store without special permission. Let alone connect with other people.
In germany test for fatherhood is illegal without consent of all party or judge ordering one. So unconsenting gene match for fatherhood probably also illegal.
All in all, probably impossible. This data will ruin more life than the joy it bring to know some random fact about heritage.