I'll bite harder. That's how the public Internet works. If you don't trust clients at all, serve them a login page instead of content.
That kind of user experience is one that I've seen a lot on HN, and every time, without fail, it's because they're doing something that makes them look like a bot, and then being all Surprised Pikachu when they get treated like a bot by websites.
That aggressive crawling to train those on everything is insane.