Medium don't want unofficial posts about crypto on their platform anymore; there will be less spam, less scam because of their requirements. At least users will be sure that the blog/announcement came from the official company which is a good thing.
For the link of reference
(since not mentioned in the main post) :
https://help.medium.com/hc/en-us/articles/360000646167-Cryptocurrencies-on-Medium
[...] Notwithstanding the rules are clear and forbidden bounty articles without exceptions.
I'm not sure if some account will not be suspended, they mentioned: "
depending on context"
Posts and accounts which do not meet these standards may be considered spam and are subject to suspension, depending on context.