It's hard to take the author seriously technically competent when reading "DynamoDB what a hot pile of garbage. I tried it and ended up with a $75USD bill by the end of the day."

Clearly there are many people - including me - who built highly scalable, available and near maintenance-free systems using DynamoDB for a ridiculously low cost.

I have no idea how you can actually burn more than $5 in development for DDB. If you don't make the effort to explore what a technology is built for and/or clearly didn't understand it, maybe you should holding back ranting about it. Unless you want to look like a fool.

Same goes for IAM. It's complex but still easily understandable to get the basics. Creating e.g. a rule where you can only read from a DynamoDB table but not delete entries or the whole table takes you under 10 clicks.