Research by the Center for Countering Digital Hate, a campaign group, showed that Mercola’s newsletters made a minimum of $1m a year from charging subscribers an annual fee of $50, with Berenson making at least $1.2m from charging people $60. Three other vaccine sceptic newsletters, from tech entrepreneur Steven Kirsch, virologist Robert Malone and anonymous writer Eugyppius, generate about $300,000 between them. Imran Ahmed, chief executive of CCDH, said companies like Substack were under “no obligation” to amplify vaccine scepticism and make money from it. “They could just say no. This isn’t about freedom; this is about profiting from lies...