Almost all other companies would say the bug was out of scope, thank you for reporting it, and maybe send you a t-shirt.
Honestly, resume uploads are unlikely to be worth much. The resume analysis software either. What information there is worth anything to an unreputable buyer?
However, I'm unsurprised to find such reasoning on HN.
But, I think it was pushed because it was Sunday and Careers team was not on site to properly/permanently fix the bug.
But hey, I'd break all kinds of functionality temporarily to make sure this exploit - which as is explained, looked worse than it ended up being, wasn't actually as bad as (or worse than) it did look.