I can definitively say llms.txt is not used by any AI players. I run a blogging platform with around 80k blogs and /llms.txt is not requested by anything (other than humans checking to see if there's an llms.txt path).
All regular pages are aggressively scraped to the extent it's a problem I have to consistently manage, but not llms.txt.
It is a highly requested feature. I just seem to have painted myself into a corner dev wise, and it's a pretty difficult feature to build without significant re-architecture. It's on my to-do list though.
Creator of JustSketchMe here! I was very surprised to see this on HackerNews this morning. Very cool to see this doing the rounds 6 years into running this :)
Creator of Bear here. Suggesting that because one project fails, others will too is a bit of a fallacy. Fact is that whether you self-host or not, you're still using someone else's platform (unless you're a real self-hoster with a box in your closet, in which case, good on you and godspeed).
I think as long as platforms have an easy way for people to backup and migrate, that's fair.
Additionally, part of the appeal of Bear is that I've made it my personal mission to get the platform to outlive me. Take that as you will. I can't prove that Bear will live on in perpetuity, but I can try my best.
All regular pages are aggressively scraped to the extent it's a problem I have to consistently manage, but not llms.txt.