I think it is necessary though. Other search engine operators have cited this as one of the reasons their search engines fail or struggle to provide as good results. As far as the engagement data goes, it’s something that the Competition and Markets Authority in the UK has looked at as part of their investigation into google. See here for a very interesting analysis of Google’s and Bings click and query data: https://assets.publishing.service.gov.uk/media/5efb1db6e90e0...