I don't find this so surprising really. Serverless removes a significant amount of initial work and ongoing maintenance. No server, no patches, no initial setup, no lots-of-things. Seems like a premium offering with premium pricing.

I also don't find it the least bit surprising that a semi-cold box in a data center can't accept a request, associate it my my account, spin up a worker thread with my stack and service my request in the same time as a box running my stack with a pool of ready worker threads.

It's nice to see someone put some real metrics on it though.