Earlier quoted context omitted.
Does this really fall foul of GDPR? I would have guessed that once your data is in the wild, there is nothing in GDPR that applies. GDPR puts certain responsibilities on groups you give your data to treat that data in certain ways in terms of who it is shared with, which would not seem to apply to someone offering a lookup of an in the wild dataset. I'm curious if my naive understanding of this is wrong.
I’m not sure how GDPR applies to HIBP. GDPR is all about data that is shared by the user. But HIBP is about data that hasn’t been shared by a user, but rather, is available publicly. It’s a grey area at the very least.
No it isn't. It covers my data no matter how you got it, with a few exceptions.
EDIT: Please feel free to point to the legislation showing that GDPR only applies to data supplied by the subject.