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@dogwonder Amazingly, it took all of five minutes: there's a Substack-specific content importer which just takes the zip file you export from Substack. And the subscriber importer accepts a zip file. The biggest tricky bit for anyone is, I think, going to be billing: you can mark someone as a paid subscriber, but they have to authorise payment again (even though it's all done through Stripe, for most publications).