[lmm]

> So as far as I can tell it wouldn't matter if it was posted on Medium or a personal blog on their own site.

Indeed it doesn't matter. Medium is just the quickest/easiest/nicest way to write something and get a nice webpage out. Compared to wordpress/blogger/... the UX is just that little bit nicer, and the resulting web page is nicer on the reader (at least, the reader who doesn't mind pushing the login button once at some point) too.