I was under the impression that, as part of this service, I would receive no information about my subscribers, or even about whether I had any. It turns out I do see which email addresses are subscribed to this—nothing more than that, and nothing creepy like IP address or location, but I figured I'd mention that in case it matters to any of you. 

You can still visit the web URL (https://world.hey.com/horses) without my seeing a thing, however! I won't even know how many people've visited. And frankly, I'd rather keep it that way.