How to Disable Personal Requests on HomePod

You can use Siri on your HomePod to access your messages, notes, and reminders, all of which are what Apple calls Personal Requests. As a rule, these only work when the device that was used to set up HomePod is connected to the same local network, which Siri interprets to mean that you're home.
That's nice to know, but it doesn't account for the fact that anyone within earshot of HomePod can still make personal requests to services synced to your iCloud account. That's not so good news if you sh