I see what you mean, but in my experience most people will at least skim the README while they ignore the license entirely. So, by putting it in a clearly visib

I see what you mean, but in my experience most people will at least skim the README while they ignore the license entirely. So, by putting it in a clearly visible position in the README (say just below the repo title) I catch a few extra people and prevent them from sending in issues/PRs in the first place. It's also not like it's a lot of work, a 30 seconds one-time investment in my time is less time than I spend on most HN comments.