New ask Hacker News story: Ask HN: Links are pouring in from “substack”, can someone please explain?

Ask HN: Links are pouring in from “substack”, can someone please explain?
2 by blickentwapft | 2 comments on Hacker News.
Is this just natural success of a new application? Or are submissions being gamed? What’s the sub stack story why has it just taken off?