CLI for publishing static web apps to the Surge CDN for free

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What's intriguing is that they not only allow you to publish static content and files for free, but also point a custom domain at them via a DNS A record.
Why is this free? It's hard for me to grasp. I hope it's the cool "if developers love us they will have their huge enterprise sign up for us" free.
Love this tool, so easy to deploy my static sites
Just tried and it's perfect for static sites....impressed!
A similar thing which lets you deploy to your own S3 bucket: