Dropbox has grown significantly since its founding in 2007, now with over 500 million registered users and 11 million paying users. It generates over $1.1 billion in annual revenue through a freemium model where the majority of revenue comes from self-serve channels. Dropbox has invested heavily in research and development, with over 600 patents issued, to build secure infrastructure and products like Paper that foster collaboration. Their focus on product experience and viral growth has led to high retention rates among user cohorts over time.