I think there are degrees to the extent of tying / linking / re-associated (you use all these). If my DNA is present in some database and at a latter point in t

I think there are degrees to the extent of tying / linking / re-associated (you use all these). If my DNA is present in some database and at a latter point in time I am sequenced again, all "metadata" (time, geography, etc...) associated with the circumstances of the first sequence getting into that DB immediately applies. In addition all genetic relatives (known or unknown to me) whose DNA is present in the DB may be affected by the circumstances of the second sequencing. The entire discussion is predicated on 23AndMe or Ancestry * not pivoting their business model and selling the unanonymized data to the highest bidder. * not being forced to reveal the unanonymized data to the authorities. * not revealing unanonymized data to hackers