The Worldcoin mobile app, created by Sam Altman, experienced technical difficulties due to high traffic as the number of unique users approaches 2.2 million. The project uses iris-scanning technology for identity verification and has faced regulatory scrutiny over privacy concerns. The app is currently under maintenance, according to World App's support team. The project has also faced pushback in Kenya, where it was the most downloaded mobile app last week. Despite introducing a unique World ID that allows users to verify their identity without sharing personal information, the German data watchdog is investigating the Worldcoin crypto project, which has been the subject of critical analysis by Forbes.