What business relationship, if any, exists between Mr. Taibbi and Substack?
Because he is an established author, and we're really excited about this new format of serialized fiction, we have also been putting extra product development and publicity effort behind his publication. We think of this as Doing a Thing that Doesn't scale, as in http://paulgraham.com/ds.html
We think this aligns our interest with the writers interest, the same way that the subscription model aligns the writer with the reader.