Economically, Cloudflare can do this because they only need a V8 isolate per instance (so barely any RAM besides instantiated JS objects), whereas a Lambda need

Economically, Cloudflare can do this because they only need a V8 isolate per instance (so barely any RAM besides instantiated JS objects), whereas a Lambda needs RAM for the entire runtime environment. So many more customers can run on the same machine, even if many are waiting on I/O simultaneously. https://blog.cloudflare.com/cloud-computing-without-containers https://blog.cloudflare.com/cloud-computing-without-containe...