They pointed to two explanations: >Google allows sites that collect personally identifiable information from users as long as this is not the primary purpose o

They pointed to two explanations: >Google allows sites that collect personally identifiable information from users as long as this is not the primary purpose of the site. >Google doesn't allow the promotion of sites that offer incentives in order to collect users' personal information (such as free quiz/survey results, horoscopes, etc.) where collecting this information is the primary purpose of the site. If offering updates on the project is an "incentive", well, I have no idea how anyone does this. The adwords+landing page concept is so ubiquitous on HN. I've asked here before and gotten no explanation.