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by josephwegner 2489 days ago
Heroku did this about a year ago. They have a list of known pwned passwords (probably haveibeenpwned, but honestly I'm not sure), and disallow accounts to use those passwords. When that change was implemented, any account using a pwned password had that password expired.

https://status.heroku.com/incidents/1625

(source: I work for Heroku Support)