Ugg. I really like where you were going with that, but you lost me at this: "People shouldn't spend any time configuring a server for a blog."
Maybe some people shouldn't be spending any time configuring a server for a blog, but I have been increasingly working to take back control of my data and it's related services. That means I want to be able to install things on a server of my choosing. This also means FOSS wherever I can possibly put it. I would even happily pay for the FOSS, but the thing I hate the most about medium, svbtle, and the others, is that I can't use the platform where I want to and I don't see gpl/mit anywhere.
I understand that your intention is the hosted segment, but I really think you could gain a lot more traction by going to a one time price, FOSing the code, and still offering a paid hosting service for those that want it.
Maybe it's just because the older I get the more I am aligning with RMS.