[carls]

I definitely think it's a good point to support Python/R for data manipulation, and allow to also JavaScript for complex visualizations.

Their current target for paid customers seems to be infoviz folks at news outlets (the CTO and co-founder was at NYTimes' data viz team for a number of years): https://observablehq.com/teams

That doesn't seem like a huge market, but perhaps they're starting with this audience segment and will be branching into more DS-type features (i.e. supporting a Python kernel, trying to be a more feature-rich Jupyter).