Plenty of engineers on the market can work professionally in C. Only a small amount of people can write Cobol (or is willing to given that is almost useless). That alone is a good reason to consider Cobol a legacy language and throw away a codebase written in Cobol.
Using DynamoDB in 2025 is such a weird proposition. Horrible dev experience, no decent clients/libs, complex pricing, weird scaling in/out mechanism, slow, it only works well for well defined use-cases.
Possibly because they capture the video from xvfb or similar (they run a headless browser to capture the video) so at that point the decoding already happened (webrtc?)
Running workers ourselves was the last resort, we tried everything else but it was impossible to get fast (and consistent) build times otherwise.
In a way we are now going to get charged for Github's poor execution on Actions.