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Given that AWS still has no billing caps (despite it being one of the most requested features), you're exposing yourself to uncapped downside.

In addition to lambdas being a poor architectural choice in most cases, that is.

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AFAIK you can pretty easily cap the number of concurrent lambda executions. Of all of AWS's services, Lambda is probably the easiest one to configure limits on.

For lambdas in particular, you can set reserved concurrency, which is the most of a particular lambda that can run concurrently at any point in time: https://docs.aws.amazon.com/lambda/latest/dg/configuration-c....

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