What should a website do when you present it with correct credentials?
Not then give you access to half their customers' personal info?
Credential stuffing 1 grandpa who doesn't understand data security shouldn't give me access to names and genetics of 500 other people.
That's a shocking lack of security for some of the most sensitive personal data that exists.
Tell me you didn't read the article without telling me.
If 14,000 users who didn't change a password on a single use website they probably only ever logged into twice gives you 6.9 million user's personal info, that's the company's fault.