Our “occasionally” exception is EdgeOfTheSandbox. Her “real socialism” pieces with her artistic eye and perspective from a woman raised in the Soviet Union have done well on Medium, so she writes here more than the rest of us. It is a good fit. (She has a section on the homepage.)
I tend to be on Medium but at Arc Digital. Rachel Darnall is doing a big share of the book work. The first offering will be essays by her.