I am happy to see that One Zero is talking about this issues, but let me say that it is same with all social media giants including twitter and facebook. I had especially written a post on this topic but found no support from Medium in internal curation or even distribution to followers. If you wouldn't mind, dropping a link to my post here.

https://medium.com/@TheSurajBlog/why-is-social-networking-allowing-fake-profiles-to-exploit-pictures-of-innocent-girls-71e8edaa64a8