Hacker claims theft of data from 700,000 Substack users; Company confirms breach

Substack confirmed a data breach after a hacker leaked data from nearly 700,000 users, including email addresses and phone numbers. Substack is an online platform for publishing email‑based newsletters and blogs, with built‑in paid subscriptions and basic analytics. It’s free to start; creators pay a fee on paid plans. In 2026 it’s estimated to serve […]

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