For reference - Lambda functions used to billed at 100ms intervals. My Node.Js function usually only takes 37-40ms to run. So this is a pretty good advancement for cost savings.
How many people actually use lambda? Always came off as a gimmick to me.
I rarely use lambda but I use alot of Google firebase-functions for majority of my server code. From my experience lambda/firebase-functions/Azure-functions are very popular.One simple usecase I can tell is payment-successful return-hook from payment servers like Stripe.Its a tiny task which just logs payment-success info and triggers a email..etc.