Aaron Foss, the founder of Nomorobo, launched an anti-robocalling service that started as a simple hack and gained popularity after he won an FTC challenge. The service has blocked over 400,000 illegal robocalls, protected more than 27,000 phone numbers, and has 22,000 active users with many more waiting for their carriers to support simultaneous ring, a key feature of Nomorobo. Despite initial skepticism from some that it was too simple to work, Nomorobo's success is attributed to its ease of use and lack of requiring carrier involvement or complex infrastructure. Aaron continues to personally respond to customer emails, which he believes is essential to his business, and is working on building a user-friendly UX for the service.