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If you have a low traffic or % of server ultiziation such as B2B applications. "Full Container on Serverless" can be insanely cheap. Such as FastAPI, Django, Rails etc running all of these on Lambda when you've only got a few hits during the day and almost none at night, is very cost effective.

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We do this at current job for most of our internal tools. Not a setup I would choose on my own, but serviceable. Using a simple handler function that uses mangum [0] to translate the event into a request compatible with FastAPI, it mostly Just Works TM the same in AWS as it does locally. The trade off comes with a bit harder troubleshooting and there are some cases where it can be difficult to reproduce a bug locally because of the different server architectures.

0: https://github.com/Kludex/mangum

It can be, but a whole lot of people fail to do this analysis properly to see whether it will be for their use case, and they get burned.

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