@feld @jomo @lorenzofb I disagree. Maybe if the data of the affected user was the only data available when logging into an account but they have broken into a bunch of accounts and then stole further data from genetic matches iirc.
Not preventing that kind of data theft when one of the parties did not have 2fa enabled is hardly the fault of the user but completely on the platform. This should not have been possible for accounts that don't have basic 2FA enabled.