I hate it when this happens to genuine writers on a blogging platform, or even to sincere users on social media.
Hasn't happened to me on Medium yet (although in the last 2 weeks I felt like I was at the verge of it since my stats & earnings tanked badly), but it has happened to me on Linkedin 2 times in the past (but then I got my account back), and also happened to me on a couple of freelancing sites. And I never found out what I did wrong.