There's more about how Mozilla obtains the data here: https://www.troyhunt.com/were-baking-have-i-been-pwned-into-firefox-and-1password/#enablinganonymoussearch

There's more about how Mozilla obtains the data here: https://www.troyhunt.com/were-baking-have-i-been-pwned-into-firefox-and-1password/#enablinganonymoussearcheswithkanonymity https://www.troyhunt.com/were-baking-have-i-been-pwned-into-... I don't think there's been studies, but it seems obvious to me that the goal here is to prevent re-use of leaked passwords, and I'd consider it a surprising result if this wouldn't help in that.