AWS and Azure stress on spending limits you can set for each card... in their documentation !

Some gen AI and ML folks seem to see a way out to make things without reading any doc or scientific literature. Gen AI is a pretty clever bit of computing, but not witchcraft yet

That is false for AWS. There are no spending limits that stop usage and cost after some threshold.

oh my bad, thanks for the info

AWS Budget can mostly notify you indeed, and terminating instances from that isn't as straightforward as on Azure