I rarely click on links when I see the source as medium.com. The quality of content there feels too much like blogspot back in the day.
Their insistence on taking up an outsized proportion of screen real estate for a header and footer promoting medium.com is beyond obnoxious.
A platform for consuming content should not distract the reader from concentrating that content.
Also if I like a blog I'll bookmark it and check back. I do not need to sign up to "never miss a story from _____."
As for Hackernoon I would be more likely to read their content off-medium. However, I do feel like I see them too often on HN, which means I now actively filter them out when deciding what to read. They are a little overexposed here.