They probably use a hidden javascript captcha, which falls back to a real captcha if not completed. I'd be hugely surprised if they dropped any kind of bot prev

They probably use a hidden javascript captcha, which falls back to a real captcha if not completed. I'd be hugely surprised if they dropped any kind of bot prevention. Having said that, maybe they figured "well, bots are getting in with the captcha, so let's just drop it". But I doubt that.