The TL;DR is that Substack has allegedly paid large sums of money to bring writers onto their platform. The writers they've paid have historically been on one end of the ideological spectrum, and Substack has not been transparent about who is being paid, nor how much.
https://thehypothesis.substack.com/p/heres-why-substacks-sca...
https://doyles.substack.com/p/in-queers-we-trust-all-others-...
https://www.vox.com/recode/22338802/substack-pro-newsletter-...
The TL;DR is that Substack has allegedly paid large sums of money to bring writers onto their platform. The writers they've paid have historically been on one end of the ideological spectrum, and Substack has not been transparent about who is being paid, nor how much.