I posted a few things on Medium, and got contacted by Hackernoon (and some other publications) about putting them on their "publication", which I allowed (and later removed). So presumably this happened a lot and lots of Hackernoon pieces came from Hackernoon contacting people using Medium, and those people putting things into a Medium publication called Hackernoon, via Medium.
So some business model drama happened and now neither party is happy, and Hackernoon is moving away and that seems fine.
I don't think they're wrong to move off Medium, but their positioning - that Medium is a big bad preventing publications and authors from moving - seems like bullshit. There is clearly a muddled symbiotic relationship here, neither is wrong, neither is right.
Tl;dr This is giving me a very poor opinion of Hackernoon.