Personal story, I used to spend a lot of time on there answering questions. My niche (web hosting) is awful. It's just bluehost affiliate link after some company you've never heard of self promo. It's obviously fake accounts using stock photos, fake names, networks of upvotes that are easy to detect. And yet... even after reporting many of them. It takes ages, if any action ever gets taken.
The worst experience which made me really stop using it for the most part. "Quora moderation has collapsed your answer for violating terms of service: be nice."
What was the problem?
I posted a long answer to a question asking about a fake company that clearly had spammed quora. I got 3 questions about a company I'd never heard of within 45 minutes from fake accounts using fake pictures/names. I researched the company, it doesn't legally exist. They were lying about when they were created (claiming to be 10 years old or something with a domain registered in last 2 years). There was no legal company in the state records with anything even close to their name (I actually had them reach out to me later and try to get listed on my review site and their representative even admitted they aren't legally incorporated). It was clearly spam and fraud. I posted all my evidence and reported the accounts.
The result? I was punished for exposing fraud and spam on Quora. Somehow that's not nice to point out and save people from falling victim to signing up for a company that doesn't exist, posts fake reviews and generates fake interest using Quora.
For the curious: https://www.quora.com/Who-is-the-ARZ-host/answer/Kevin-Ohash...