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I believe Safari does the same as well, so not even technically the first at Apple if I’m correct?

After reading the technical details... I'm really not sure tbh: https://support.apple.com/guide/security/password-monitoring...

I'm sure someone here understands that and can answer conclusively, but that's not me today.

No, the Apple article says that they're using the much faster and easier to implement k-anonymity strategy