Digital platforms and ecosystems are experiencing exponential growth and disruption. Understanding their dynamics is important for startups, platforms, and ecosystems. Platforms go through phases from pioneers seeking opportunities, to settlers addressing demand, to town planners optimizing operations. Innovation occurs both on top of and below interfaces as value increases. Designing platforms requires understanding value exchanges between roles to overcome challenges like liquidity. Growth involves working like a startup, nurturing relations like a platform, and always disrupting yourself like an ecosystem.