The hostility to Quora seems a little excessive. Is it so bad to just sign up, then be able to use it from then on? I don't see why someone would actually be offended by this kind of thing.
(All right all right, you can do the "but it's technically not content cloaking" quora astroturf dance now; but you know the saying: if it walks like duck, swims like a duck, and quacks like a duck...)