I am an hobby Android developer and the developer of an app called Teleposter. It’s a simple and lightweight wrapper around the publishing platform Telegraph, which is created by Telegram and helps people publish articles the most simplest way.
It’s even more simple than Medium. You don’t need to create any account or something like this. Just write and publish. It is pretty nice for Telegram Channel owners, who like to share some more information than possible in a simple Telegram message.