I've encountered this. A project I worked on was a API site that helped members of another site track their account milestones, using info gathered via a public

I've encountered this. A project I worked on was a API site that helped members of another site track their account milestones, using info gathered via a public API. Though the information was all public and available without any authentication, some people felt like it was an invasion or privacy and that others would use it to 'spy' on them. We could have actually used more telling and personal info, however, and chose not to - if someone was really interested in gathering data about another member, they could have done a lot better than to use our site. Same principle, anyhow... public data made more accessible was considered a privacy violation. This does make sense, as lowering the access barrier to make other people's data attainable quickly and easily has a significant impact on whether third parties will view it at all.