Jim Acosta, the frequent Donald Trump antagonist who was all but pushed out by CNN earlier this year, may not be the type of person you’d suspect would be a hit on Substack. In fact, when he signed off from his CNN show for the final time at the end of January, he barely knew what it was. “I thought Substack was a place where people posted their articles and opinion pieces,” he said. He could be forgiven for his mistake. When Substack took off in 2020 amid the newsletter boom — which came and went, then came back again, perhaps this time for good — it positioned itself as an email service.
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