I understand your metaphor in the sense that The Matrix is a scifi adaptation of the allegory of the cave. The concept that commercial/online bookstores are where items worth finding will be found is like thinking the shadows of the cave are the only thing worth seeing. You are correct, there is so much content there be found, which isn't limited/controlled by what the big market values.
Additionally those are very good points about English and streaming. There are books out there which are not translated and not digitized, which are absolutely worth reading, and will not be found anywhere besides private collections, used bookstores, flea markets, estate sales. Some of these books were originally purchased long ago and/or far away, just because they are not popular enough to be easily found does not mean they are not worh finding.
A friend of my dad is a professional book hound, and he says it amuses him when he sees others who can’t understand what to do with a book that doesn’t have an isbn.
When my wife and I wanted to catalog our modest home library (~1500 books) we were stunned when we discovered that the vast majority of web-based cataloging software assumes that all books have an ISBN. (Or did in 2015 or so). Thankfully LibraryThing does not make that assumption, and is great.
Additionally those are very good points about English and streaming. There are books out there which are not translated and not digitized, which are absolutely worth reading, and will not be found anywhere besides private collections, used bookstores, flea markets, estate sales. Some of these books were originally purchased long ago and/or far away, just because they are not popular enough to be easily found does not mean they are not worh finding.