Fascinated with Substack newsletters? Nearly all are niche-y; many are pitchable. As in the world of podcasts, however, Substack newsletters often are launched by gifted, overextended SMEs who wind up writing once or twice -- or never -- and then abandon the project. Those who stick it out create big value for passionate readers.
Add Substack to the list of platforms frustrating to PR -- Product Hunt, Stack Overflow, Reddit, Quora -- that command attention but aren't pitchable like publications. Founded in 2017, Substack is a publishing platform for indie newsletter authors. It's cool and we'll get into why, but Substack's web site is more or less a metaphorical black box.