Any organization that wants reliable latency, data processing guarantees (it's a big leak vector for company secrets), etc., will use such a search provider over the solutions you outlined.
Especially for chat-like use-cases (in contrast to coding), latency is a lot more critical, especially if you kick off a small single query question. On antother axis, scrape-reliabilty is important for a deep research job that will fire ~10+ web searches and ~100+ web fetches.
e.g. in our chat platform[0], we offer first party MCP servers for web search[1] and web access[2] which work decently well, but some of our customers that prioritize quality over cost, they go with dedicated providers like LinkUp[3]
[0]: https://github.com/EratoLab/erato
[1]: https://github.com/EratoLab/web-search-mcp
Can you explain how this would help protect a company's secrets? I would think that if you want to keep your IP secret surely using something like Deepseek's API directly is not ideal and hosting something locally is best practice.