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robots.txt is meant to be read by robots, hence the markup and location.

for humans just use normal web pages. like an 'about' page, for example

Perhaps humans.txt would suggest which kinds of humans should and should not visit this site. Under-18s, for example.

It's about the developers, not the users.

I know what it is about. I'm suggesting a humans.txt which actually makes a decent analogy with robots.txt.