They abuse rel=canonical to increase their search engine rank but slam a registration wall in your face when you try to go read the content on their site.

https://news.ycombinator.com/item?id=6301280

- They blur their answers for non-registered users. They're wasting my time when I think I find what I'm looking for only to find a blurred image. Just tell Google you don't want to be indexed if you don't want to share the content.

- You can't use their website without using your real name. They're really persistent in this. A pseudonym won't do, they'll ask you to identify yourself with a scan of your ID before they let you participate. It's ridiculous.

That's not true. You can register an account with a fake name and you won't be required to provide any ID.

That's not my experience.

I just moments ago successfully registered for Quora using my fake Facebook account (which has a realistic sounding name.)

They are blurring the answers. If you search for something and end up on quora, it can get a bit frustrating , due to the fact, that you can't read the answers and are forced to sign up. That's just rude.