Sweet project! There's also https://curio.io which I stumbled across reading Aeon, and it's got high quality but pretty low volume of content so far (I'm sure they're working on that).
Articles unlike books are being produced in the millions everyday and so it’s really hard to find the best pieces to read over.. which is what they have to do.
I think there is room for letting people listen to anything and AI/ML advancements allow us to get pretty damn close.