Remember when the FBI scanned the anonymous DNA database, from either this or some similar company, found a match, then used that match to get a warrant for the match's personal info? I do.
You're so wrong about the specifics that you're being (intentionally?)
misleading.
The database they use is GEDmatch, which is a fully volunteer non-for-profit operation. The entire point of the database is for users to upload their dna to allow anyone from the public to conduct genealogical research. GEDMatch does not even provide sequencing services, so there's no way someone would accidentally share.
