I've recently seen some compelling and simple internal tools that were built on top of Google Sheets in unexpected industries far away from SF.

An online spreadsheet + UI + optional external API calls seems perfect for fast development of a large number of straightforward internal-facing apps, including lots of things that are currently done on paper.

For those limited and simple use cases Google Sheets is a far more usable "serverless" platform than a lot of stuff in the hype cycle right now.