Worth mentioning that the value of HIBP is largely based on trust in Troy Hunt. I think he’s an incredible guy who does incredible work; but he’s also an Australian citizen. Due to our new surveillance laws, he could be forced to backdoor HIBP, or more likely, Pwned Passwords. This is possibly a step by Troy to mitigate that risk, and given his position I’m surprised he didn’t mention that at all in this post.
It's not a repository or method of communications.