As a product manager for WhatsApp with a $2B budget, my first priority would be to focus on improving the app's performance and reliability. This would involve investing in infrastructure upgrades, such as servers and data centers, to ensure that the app can handle the increasing number of users and messages being sent every day. Additionally, I would work to optimize the app's codebase to make it more efficient and reduce the occurrence of bugs and crashes. Another area of focus would be to enhance the user experience. This could involve improving the app's design to make it more intuitive and user-friendly, as well as adding new features that users have been asking for. For example, I would explore the possibility of adding video chat functionality to the app, which would allow users to connect with friends and family in a more personal way. In addition to these improvements, I would also prioritize security and privacy enhancements. Given WhatsApp's reputation as a secure messaging app, it's important that we continue to invest in encryption technology and other security measures to protect users' data and ensure their privacy. Overall, my goal as a product manager would be to make WhatsApp the best messaging app on the market, with a focus on performance, user experience, and security. By investing in these areas, I believe we can continue to grow our user base and maintain our position as a leader in the messaging space.