I would say that it's Quora's problem. I thought they had some really good security but I guess not. But this time of year? Nothing really surprises me. I'm sure they'll get it cleaned up as most hackers always leave behind a "footprint" just to let them know they've been hacked.
https://www.forbes.com/sites/daveywinder/2018/12/04/quora-hacked-what-happened-what-data-was-stolen-and-what-do-100-million-users-need-to-do-next/
Really, was it a fault from Quora side (or) from your side?
Quora is fault.
Nope, sorry that you had to deal with that.
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