It's not clear to me, due to the particular nature of the data in this breach and why it was available to the 14 000 compromised accounts, that it getting breac

It's not clear to me, due to the particular nature of the data in this breach and why it was available to the 14 000 compromised accounts, that it getting breached will actually cause any damages. This is data that appears in the ancestry data for the 14 000 compromised accounts. Your data only appears in another account's ancestry data if you opted in to sharing ancestry data and they are a relative of yours. I think most people opt in, because (1) finding out about your ancestry and relatives is one of the main reasons people use services like 23andMe, and (2) even people who started using it just for the health data often get curious and start using the ancestry stuff too. 23andMe counts anyone who is a 4th cousin or closer as a relative, which results in some big relative lists. Mine has 1500 other 23andMe users in it, but that might be above average. Based on 23andMe having 14 million customers, 14 000 accounts being compromised, and 6.9 million accounts having data taken via the relatives lists of those 14 000 compromised accounts, and assuming that everything that I don't have any data on is is pretty evenly distributed (the statistical equivalent of a spherical cow) I'd guess that the average is around 700. If that's even in the right ballpark then when you opt in to sharing this data you are opting in to share it with several hundred people, mostly complete strangers to you, mostly scattered all over the US and a few foreign countries. At that point I'm not sure if the different between just sharing it with them and sharing it with the world is meaningful.