Scott Hanselman, upon seeing Quora’s requirement to download their app to view more than one answer in a thread:
This implementation goes against everything on the web. You’re not just actively preventing me from visiting your site by forcing me to log in, but you’re also actively forcing me to download your app to access your server.
Quora’s particularly horrible for this. If you sign up for an account, you must select three topics to follow, and then three areas of interest within each topic. I tried to get around that by unfollowing those after completing my registration, but Quora recognized that and required me to maintain those nine followed topics at all times. Quora is incredibly user-hostile.