It seems like the whole world is moving toward subscriptions. There are dozens of streaming video and music subscription services, apps are increasingly embracing subscription models, and Apple has several new services of its own.
Odds are, you have a few subscriptions billed through Apple, either from Apps or Apple’s own services. And if you don’t, you probably will before long. Apple sends you email receipts every time a subscription renews—not ahead of time as a reminder, but after the fact like a normal purchase receipt. If you have a number of monthly subscriptions, it can quickly get out of hand.
Fortunately, Apple recently added an option to disable those emails.