If Medium were more humble, or if they had competition, I would relax about it. But I remember how much RSS suffered for being dominated by Google. And Google was a huge company and could have afforded to run Google Reader forever at a loss. Medium is a startup, a well-funded one for sure, but they could easily pivot and leave all the stories poorly served, or not served at all. I’m sure their user license doesn’t require them to store your writing perpetually, or even until next week.
This article makes a really interesting point about how your content being held in an eco-system like Medium isn’t a good thing.
Personally, I use places like Medium and Pulse for their discoverability in aid of pointing more people towards this blog. Given the points raised in this post, I think that’s probably the best way of using these kinds of services.