Another interesting difference (that I personally find to be one of the best features in Neeva) is the ability to connect apps. You can then search not only the public web, but also private data from your Slack, Github, Gdrive, Jira (etc) accounts. We're hard at work adding more integrations in the near future as well.
Is there plans for students? (I guess you might not have any inputs on the pricing model)
Students (especially CSstudents) being exposed to this ahead will probably help them in and these are the kind of demographics that would pay for a search engine.