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Looks (and sounds) a lot like The Outline [1].

Doesn't sound alike to me... The Outline says it's story-centered, while The Markup says it's data-centered.

I agree the visual style is similar.

Societal harm? Sounds like a clear agenda.

They don't claim to not have an 'agenda' only that they are non-partisan.

The Markup – A new kind of journalistic organization