Medium’s position sounds very reasonable and good to me. After all, I want Medium to promote my work. I want them to share snippets of it across social media and across Medium itself. That benefits me and all of us.
I don’t believe for a moment that Medium is trying to sell our work and not pay us for it.
Sure, they could have been clearer with why they were adjusting the terms of service, but I don’t have any problem giving them the benefit of the doubt for their legalese.
Lawyers are traditionally terrible at public relations. The lawyers did what they were asked to do for reasons that benefit us writers. Unfortunately for everyone, other Medium staffers didn’t anticipate how people might see the matter.
I hope it is all clarified now.