If you let it go that far then you were going to blow it one way or another - it’s not an excuse to totally ignore the cloud spend but it’s a n excuse to defer it to a later date. If your successful, fix it, if your not then AWS aren’t getting paid anyway!
Yeah, they had an impossible to use number of credits (YC) until they expired, so every problem became a AWS solution.
As an example, they needed a lot of proxy servers. Instead of just using a proxy service, there was a fleet of ec2 instances.