Well there's two reasons. Firstly, you're not producing a competitive advantage by writing your own site. Unless you have some specific purpose, why would you w

Well there's two reasons. Firstly, you're not producing a competitive advantage by writing your own site. Unless you have some specific purpose, why would you waste your time. Let's assume it takes you a couple of weeks, that's probably thousands of dollars of lost wages when you can use substack, medium or even wordpress for basically free. Secondly, whilst these companies are trying to claim the responsibility of a peice of infrastructure, they're actually trying to be publishers, they control discoverability. You go to substack because you want to scoop of some of that substack readership, you want to be part of their "webring" and hope that you get more readership whilst they monetize your activity by telling VCs they have their boot on your neck.