Re: "Serverless" is a marketing term. No more, no less.
And (forgive me if I'm misunderstanding here) the concept of having a bunch of individual units of logic with a well-defined input and output running and interconnected transparently over multiple distributed and disparate pieces of hardware doesn't feel particularly new either. (I'm far too young to have used it, but I believe Plan9 was possibly just "too ahead of its time"?)
Biting the hand that feeds IT
