If somebody accesses a Facebook account; and uses it to view intentionally-shared information on 500 people connected to that person; is that Facebook's fault for having that feature?
It appears Hacker News consensus is "Yes", but... that feature IS Facebook; and to many many people, that feature IS "23andme".
Don't get me wrong - I don't have 23andme account; we are at an early age of DNA analysis and I'm supremely uncomfortable randomly giving my DNA and wide permissions to strangers for perpetuity. I've tried to give same perspective to friends and family, with limited success.
I also don't particularly care about geneaology either, yet goodness gracious a lot of people really really do and they get giddy and excited when they find some 'match' on DNA sites :).
But it does rather seem that external actors used credentials obtained elsewhere, to access a core "social-network-like" feature of 23andme, that users eagerly opted in (again, I wouldn't have, but I'm a weirdo:).
I don't understand what 23andme's real fault is, other than existing, and allowing users to willingly, consensually, in an informed manner do what they specifically chose to do. We all told our friends & family "hey don't share your DNA results and intimate details of your life with strangers and random new startups", but they repeatedly choose to do so anyway :(.