Amazon blog post in which they describe moving off serverless and to a good old monolith with a thought through architecture:

"Moving our service to a monolith reduced our infrastructure cost by over 90%. It also increased our scaling capabilities."

Looks like without the flow of free money, some teams are coming back to their senses.

https://www.primevideotech.com/video-streaming/scaling-up-the-prime-video-audio-video-monitoring-service-and-reducing-costs-by-90