I hope this works out. I'm a big believer that companies eventually take the shape of their business models, and if you're free but serve ads, you're an ads company, not a search company. So it'll be interesting to see how a company without the ads tension ends up evolving.
That said, search is a really hard problem to solve (even if you can take shortcuts like using Bing's API).
That said, search is a really hard problem to solve (even if you can take shortcuts like using Bing's API).