Medium sends unsolicited emails to your email address. There is absolutely no way to unsubscribe from their emails. They deliberately force you to keep receiving their emails or to subscribe to their website. Their "Unsubscribe, Help Center, and Privacy Policy" links links reverts to their subscribe page.
There is no way out. To hopefully unsubscribe I have to mail my request to unsubscribe to their emails and to voice my complaint. I have also filed a report w the Better Business Bureau in hopes they will allow any person to unsubscribe and not be forced to keep receiving their emails.