Because it’s full of people who think it’s great?

Seriously now, content mills like Medium and Substack are simply not appealing to people who want more control over how their site renders. Or in fact, who want any sort of control over their content.

I like my content in Markdown on my own git repository, thank you.

Glad you like it, but it's a million miles from my ideals. I want my content to be under my control and free to read without obstruction. My blog loads hundreds of times faster and uses far less bandwidth than a Substack newsletter blog.