+1 - if I am reading hackernews and see a link that is from medium I will skip it. 99% if the time it will be some thinly-vieled marketing. I am sure there is a lot of perfectly good content on there, but the bullshit marketing crap has turned me off of the whole domain. It is basically as bad as seeing a wordpress link, except you can guarantee that 99 times out of 100 it will be someone peddling their startup (at least wordpress had some slightly out-of-left-field stuff on it)

There is nothing wrong with self-hosted blogs. If you still want to "blog" then go for it on your own domain, please don't feel like you have to publish through some random third party that exists to monetise your content.