@glyph @mcc @whitequark It's my view that the "social problem of password reuse and account compromise" is a problem mostly for sites, not actual people, users, and trying to force users to change behavior & put themselves at risk of credential loss to solve it is hostile cost externalization.
Most compromised passwords are for garbage accounts people never wanted to have. They should have been offered ability to use service without account or with Craigslist style login.