It looks like you get 1 month "free". Open the article in incognito mode and it's available without registration.
Oh wow, one free story for logging in! Such generosity of content other people wrote for free. Why did we all leave LiveJournal again?
[1] https://chrome.google.com/webstore/detail/mediumcom-unlimite...
[2] https://github.com/Gyvastis/chrome-medium-unlimited-reading