Meta Platforms Inc.’s WhatsApp is rolling out interoperability features across Europe, allowing users to send messages to individuals on third-party applications starting in November 2024. This initiative is in response to the European Union’s Digital Markets Act (DMA), which requires dominant tech companies to enhance competition by opening their platforms. Users will be able to communicate while maintaining end-to-end encryption, a process that has taken over three years to develop. Users must opt-in to receive messages from third-party applications, and the initial rollout is limited to specific partners. The interoperability allows for sharing text, images, voice messages, videos, and files. Meta's engineering team adapted WhatsApp's infrastructure to accommodate external services while upholding encryption standards. Concerns have been raised about potential security vulnerabilities and the implications of proposed regulations like "Chat Control" that could conflict with encryption efforts. This development could influence competitive dynamics in the messaging sector, providing smaller applications like BirdyChat and Haiket visibility by integrating with WhatsApp’s large user base. Compliance with the DMA helps Meta avoid fines while risking dilution of WhatsApp's market dominance. Privacy implications are a significant concern, with discussions around how interoperability could facilitate surveillance or compromise user security. Meta's journey involved regulatory oversight to ensure compliance with DMA objectives, and the success of this initiative could set a precedent for global standards in digital communication.