Too many ebooks are Amazon exclusive for that to be viable. Within the fantasy genre, at least. I agree with you generally but this was a valid way to support authors while still reading on non-Kindle eReaders. Amazon just shut that door.
This would be great at work, but most orgs would never allow some terminal app to connect out to an LLM we've never heard of and have no understanding of the privacy of, especially for difficult to quantify efficiency gains.
Would you ever consider a version that allows redirecting to a locally hosted LLM server?