I think what ftxbro is saying is that Medium and Quora have both worthless content and a horrible user experience, and people ignore them because of the horribl

I think what ftxbro is saying is that Medium and Quora have both worthless content and a horrible user experience, and people ignore them because of the horrible user experience, so their worthless content does not get shared, whereas Substack has worthless content but a pleasant user experience, so its worthless content does get shared, and he hopes that its user experience degrades, so this stops. EDIT: Which is surprising; surely a fellow traveller of the EA/LW crowd would understanding optimising for the maximal update to your prior?