Quora is all user-generated content that they monetize. They actually pay users to post questions (but not answers).

Is that why question quality is so low there?

Yes. The strategy is to generate SEO for every possible question someone could ask on Google and then link it to Quora.

It had amazing content in the early days and still has great answers but the sheer number of nonsensical or slightly tweaked but endlessly repeated question is driving away writers. Paying people to post these questions is just backwards.

Snail mail is already gotten. I get junk mail from 8 different past tenants at my unit, and I'm sure I'm still getting junk mail at all my old addresses. Google your name right now, and I guarantee you will find your address and other personal info on one of those dime a dozen background check sites, because companies have operated under the philosophy that your phone numbers and physical addresses are public facing information that you could find in a phone book, and are free to sell or pass along.

They (Quora) don't hate you if get to their site via a Google referer. That's really shameful.

How do you know?

Tried it.

Quora does not generate content, it's users do.