From a website owner's point of view, I see LLMs mostly as competition at best, thieves of my researched content at worst.

From a User's point of view, I am using LLM's extensively and conversationally (in fact, much like you'd speak to a TNG-era Starfleet computer. I even gave it some ... personality). No need to surf the web for info when what I am looking for is in the AI answer.

To make an AI a 'better search engine', which then redirects me as an user to some website (which may or may not contain what an AI answer would have given me to start with) sounds like several steps back.

So ... I don't see the point in LLM.txt

Also, making this a markdown file (and not a text file, as .txt implies (which would mesh nicely with other .txt files, like robots.txt or abuse.txt)) clashes with the vast majority of static site generators and will need extra steps...