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I think this project runs on the QuickJS engine

It's built on QuickJS.

I wonder how popular "sever less" would be if it were called "depending on the kindness of strangers"

Since we're paying for it I'd call it more of "depending on the competence of service providers." AWS Lambda experience has been great for us in that sense, so I'd be looking forward to more general availability of this for Lambdas.