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.
Distribution is blocked by big tech and even mentioning what you are working on will get you perma banned from most subreddits because of "spam" In fact, HN is a rara avis in that it allows "Show HN" posts
My Mastodon server has seen six posts mentioning it since September 2022. Most of them are tagging Leo Laporte, a well-known tech journalist presumably trying to get him to talk about it. He did[1], but apparently not enough to generate much buzz.
[0] https://www.reddit.com/r/technology/comments/10diym9/neevaai...
[1] https://www.twit.community/t/twig-707-heartlessness-as-a-ser...