I’ve been pretty happy with Kagi and they have a decent privacy policy: https://kagi.com/privacy
When companies start to focus too much on growth usually they start to lose sight of their values and greed begins to take over. That said I just checked their ad policy and while they do physical ads, it’s still a pretty reasonable policy.
They still won’t be showing up on random YouTubers videos like Nord
I’ve really been enjoying Kagi. They seem to have a pretty good privacy policy as well. However Searxng is probably the best for privacy since it’s self hosted.