I'm in the target audience. I know what a search engine is. I know how to change my default search engine in all of my browsers, which I know are distinct from search engines. I care about privacy enough that I default to DuckDuckGo, not Google. It would take some convincing, but I'm neither opposed nor unable to pay for a better search engine. I read HN somewhat regularly.
This is the first time I've heard of Neeva.