Tina Brown, a former editor of Vanity Fair and The New Yorker, has joined Substack, a self-publishing platform for independent writers. Speaking in the week of the Truth Tellers summit, which she founded in memory of her husband Sir Harold Evans, she highlights concerns about press freedom, particularly in the face of legal and financial pressure from media owners. Chris Best, co-founder of Substack, outlines the platform’s business model, which he says offers creators editorial freedom, prestige, and financial incentives.