The newsletter-hosting site Substack advertises itself as the last, best hope for civility on the internet—and aspires to a bigger role in politics in 2024. But just beneath the surface, the platform ...

When the writer Ryan Broderick joined Substack in 2020, it felt, he told me, like an “oasis.” The email-newsletter platform gave him a direct line to his readers. He did not have to deal with the ...