I also always wonder how companies can simultaneously offer to sell their highly advanced AI-bla search, yet utterly fail at searching themselves.

I still remember the time when Google tried to license their search servers to enterprises. It appears that market has now been completely eaten by Algolia. And my hunch is that it's because Google's search results are completely irrelevant for professional users. I search for a Windows API function name, and I get pages of SEO spam trying to sell me an unrelated Udemy beginner's course.