I would be really curious if anyone who does post on Medium was able to offer some insights into where most their readers come from. Is it from people already on Medium or external. Don't know if they even have access to metrics like that.
He wrote an article on his blog. A few dozen people read it over the next week -- basically all friends of his. He cross-posted it to Medium and he had 30,000 reads within the first 24 hours.
Looking at the stats on my own Medium posts how much comes via Medium and how much is external varies. On a story with 3,000 readers (which is the most I've ever had), about 10% come from Medium. Most of what I post ends up having 20-30 readers and about 50% come via Medium.
Our Google Analytics filters out bots and crawlers, which do significantly inflate pageview stats.
I just want somewhere nice I can post simple factual articles I enjoy writing. My articles aren't ones that show up behind the Medium paywall, I'm under no illusion there's money in it for me.
Medium can tell you where your readers come from.
Here's a Medium stat screen: https://imgur.com/a/8VhJEhJ