Proton is the most visible test of a question the consumer internet avoided for two decades: can a company sell privacy directly to its users, at scale, without advertising, venture capital, or data monetization? Started in 2014 by scientists who met at CERN, it grew from a crowdfunded encrypted email service into a suite of mail, VPN, calendar, storage, password, and AI products, now controlled by a non-profit foundation. This collection reverse-engineers the business behind that story in seven modules: the mission-first start, the freemium economics, the 2015 attack, jurisdiction as a product feature, the expansion into a suite, the financing, and the fight with the platforms Proton depends on. Each module separates Proton's own claims from independent evidence and ends on the strongest critique of the decision, so readers can judge where the lesson transfers to their own company and where it does not.