Earlier quoted context omitted.
You don’t lose many customers - because they’re not required to light a huge “ice cream machine broke” before you get in the drive thru. And once you’re in line and ordering you’re unlikely to cancel just because the machine broke. I’ve even had the app be wrong and let you order an ice cream when it doesn’t exist - then they lose money giving you a more expensive substitute.
But next time you might go somewhere else. Some people go there every day and they tell their friends - that sums up.
But variable reinforcement works better than fixed one, so ice cream machines working being a gamble might actually increase customer addiction.