I worked for a startup company - the founders were really nice people and had put their own money in - quite a lot of money - to get the software built for the vision they had.
By the time I joined, 18 months after development had started, a giant, complex, hideously tentacled software beast had been built that used every possible AWS service that the massive offshore team of developers could find to use.
It should have been built on a single Linux box by a single senior developer with Python and Postgres or nodejs or Ruby or whatever.
They went out of business after not too long and I couldn't help wondering if things might have been different if they hadn't spent a fortune building a giant money making machine for AWS, instead of making a web application on a Linux box.
Every AWS project I have worked on has had some significant work put into programming AWS instead of writing business functionality.
> hideously tentacled software beast had been built that used every possible AWS service that the massive offshore team of developers could find to use
To be fair, if they had a AWS Solution Architect involved they heavily push you down this road and if they manage to get in management's ear they'll push the idea that server-less AWS features is vastly cheaper.
If you're only responding to a handful of requests that's true, but once things ramp up you get "nickel and dimed" for everything: API Gateway requests, lambda execution time, DynamoDB read/write units, CloudWatch logs, outgoing data, step function transitions, S3 requests.
I understand all those services cost money and they shouldn't be free, but I question if paying all those micro-transactions is worse then paying for your own VMs, especially once your customers complain about the cold starts and you think you can fix it with "lambda warming"