but it’s not “visitors” – it’s “visitors who don’t care enough about your site to register for an account” – and the request is not for it to be hidden, but to let the bots see it, use your bandwidth to get it and then, if they choose to follow your instructions, not add it to their index.
If you think your off-topic information is so alluring and fun that you want people to see it without creating an account, then why not have it indexed so they can find it?
I am not trying to be difficult–I have no authority here, but I don’t see how the request is going to help you. Perhaps those who have influence over what goes in core understand.