You'd probably have to really work at it. Most registrars are going to send you multiple emails leading up to the expiration, when it expires, and after it exp

You'd probably have to really work at it. Most registrars are going to send you multiple emails leading up to the expiration, when it expires, and after it expires reminding you it expired. You'd have to miss a lot of emails. And once it has expired, you have (depending on the TLD) over a month of grace period where it's not available for general registration where you can still renew it. You'd have to miss the fact that all of your services were offline for over a month.