Elon Musk wanted to buy Substack not long after he bought Twitter in 2022. But the newsletter and podcast platform wasn’t for sale. This month Substack raised a further $100 million (€85.44 million) in investment. The deal put a reported $1.1 billion valuation on the business. For now, Substack remains privately owned. Even though it’s been around for eight years, it’s only in the last couple of years that Substack has become more visible and popular. Part of the reason is that several big-name writers have started using the platform. Margaret Atwood, George Saunders, Miranda July, Salman Rushdie, Chuck Palahniuk...