The author purchased an HP printer with an HP Instant Ink subscription, which promises to send ink when the user is running low. However, after cancelling the subscription, the printer would not print despite having ample ink left in the cartridges. The issue is due to HP's terms, which state that the ink is always owned by HP, even when in the user's possession. This means that once the subscription is cancelled, the user can no longer use the ink that has been sent to them.