I don't disagree with the sentiment of the post, but unfortunately this has been the norm for web service terms for a very long time. As far as I can see, there's nothing unusual in what Quora specifically is doing here.

Even HN's privacy policy and terms include both an arbitration agreement and phrases very similar to the ones he's complaining about, like:

> By using the Service, you agree to the practices described in this Privacy Policy.

> Your continued use of the Site after the date any such changes become effective constitutes your acceptance of the new Terms of Use.