BMF.io affiliate program can avoid cookie overwriting by using a combination of unique, persistent tracking methods and integrating with advanced technologies like first-party cookies. One approach is to implement cookie-based tracking with a longer lifespan, ensuring that affiliate data is retained even if a user clears their cookies. Additionally, employing server-side tracking or "server-to-server" integrations can help bypass issues with browser-based cookie overwriting. Another strategy is to use UTM parameters in URLs, which can be tracked even if cookies are cleared. By diversifying tracking methods and making use of both client-side and server-side technologies, affiliate programs can ensure more reliable tracking and reduce the impact of cookie overwriting on their performance data