Why do you recommend 1Password, which is not on F-Droid, let alone have not Anti-features?
This doesn't seem to be a feature suggestion, but to answer your question, there's literally a button on the front page of HIBP that says "Why 1Password" and it links to here: https://haveibeenpwned.com/1Password
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If you're looking for the highest standard of privacy and security, then this is what you're after: https://twitter.com/1Password/status/1817999780066508831
If you have a philosophical preference for FOSS then it's not for you, but that's a different objective.
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hogdog commented
I very much appreciate your time, dear Troy Hunt!
However, I was thinking more about FOSS and security rather than feature-rich wise.
I'm not sure I can trust organizations like 1Password (or Tuta or Proton, or others similar), because, being not FOSS, or not FOSS at least on the server side, they could very well be APT Honeypots from a patient authoritarian regime, IMHO. In my perspective, I'd perhaps choose KeePassDX instead.