why can't both YouTube and Google search results be directed to query all video content via Closed Captions?

In other words, search audible speech through any period in youtube.

Any search engine, of course. But as alphabets Google owns both the search engine, and the video platform with embedded captioning… they have this capability, though it is not currently shared with search results for us anywhere.

Invisible censorship. Imagine how much more robust all search results would be, how specific in time period search could identify when and how things begin trending, by whom, amplified by who ,etc.