While looking through the orders on Google Play, I noticed that someone in Calgary has forgotten to cancel their Legacy Subscription. They were only charged 10 cents to renew it, but let me take this moment to remind everyone of how the Legacy Offers works.
If you had a license key app from the V1 version of the app, you were presented with a "Legacy Offer". It was designed as a minimum-cost subscription, but so you didn't have to pay even that as it had an attached 30-day trial. It isn't the subscription itself that grants you unlimited access to the V2 version of the app, but rather the RECEIPT that's generated when you obtain this subscription.
The idea is that you CANCELLED that subscription immediately, leaving behind the receipt, and thus lifetime access to the full app.
I can't find out who this user is, as Google Play doesn't provide me with that information, but it did tell me roughly where they lived. If I'd known their email, I would have contacted them directly.