Is it legal?

Completely legal. This is publicly available Reddit data, not something we scraped illegally.

The playground seems cool. I think I get a sense of how this works and could see myself using it. Is it fair to assume this plugs into a VM behind the scenes? Shared?

Out of curiosity, is any part of this also open-sourced?

Yes!! The runtimes are ephemeral VMs/containers with no network access (exposed)

On OS, the core of the solution is not currently open source; it’s still changing a lot, and I don’t want to publish an API or SDK surface that I’ll immediately have to update.

But I plan to open-source the CLI package and SDKs shortly

I don't wanna sound like a prick, but what's wrong with the receipts?

I may not be your target audience, but I run a business via Stripe, and tbh the receipts look great to me

I can barely use the dashboard. The impact may be larger than what's currently reported (beyond deployments)

I believe this is a big part of why many recent websites look identical. Also, LLMs seem to be great at it, and it is the default for generating websites in products like Lovable, Bolt, V0, etc.

Nice! Reminds me (ever so slighlty) of Posthog's redesign https://posthog.com

I am absolutely impressed by their design.