This is stupid.
What's more stupid is their desperation for you to interact with their site. I went to remove my unused account, and this is what I got when I typed www.quora.com:
You'll notice that I couldn't do anything else - I "had" to choose 5 extremely broad subjects that I'm supposed to be interested in, in order to be able to view my profile. I selected 5 subjects randomly, and...
Only after that they kindly allowed me to view the main page and my profile. I deactivated my account, and won't ever click on a quota link again (and would add them to my spam list so they won't show up in my Google results).