BBVA run the numbers on AWS Lambda vs bare-EC2 cost effectiveness. This is a good analysis, as of Dec 2020 pricing at least:
With traffic profiles where requests arrive in at periodic intervals, and a low total amount of requests, serverless architecture seems to be a great architecture in terms of cost, speed of delivery and effort. Thus, Lambda is probably the way to go if our application has sufficiently large periods of inactivity. Once the break-even point is reached, when EC2 is more cost-effective than Lambda, the cost difference grows rapidly, making Lambda less and less attractive in terms of cost. Thus, it is of great importance to know if the expected amount of traffic will be around the break-even point. Be aware of the CPU throttling you will get with the smaller memory flavors of Lambda. If your code is CPU-bound, choosing the smaller memory flavors might not be an option, since execution times, and thus latency, might grow beyond your requirements. On the other hand, if your code is I/O bound, the CPU throttling might not affect you significantly. Break-even point (if there is one, that is) strongly depends on the application itself. Without measuring the target application code, knowing the intended usage of the service, the SLA and the capabilities of the team in charge of building the application it is almost impossible to know for sure which service, Lambda or EC2, is more convenient.IMO there are still significant costs in organisational and infrastructure terms around replacing a working EC2 infrastructure with a Lambda-based one; deployment and other integration points with AWS are extremely tricky to deal with. But this is good data on the $ point alone.
Yes, I know about Pi-Hole. If you are telling me about Pi-Hole you are inadvertently proving my point, which is that responsibility or intentionally parenting these days involves a frankly unreasonable and untenable amount of both content moderation both passive and interactive and at this point a quite enraging amount of goddamn systems administration.