The Macro and Micro of Donating to Infrastructure

There are plenty of ways to be a good citizen to FOSS Infra, being able to contribute financially isn't the only option for organizations seeking to donate resources.  We'll compare and contrast engineering, hardware, personnel and monetary contributions your organization can make to projects and communities, ie  What does donating 1/2 of a developers work time instead of a financial contribution of similar magnitude look like for the project.  Why aren't my 500$ credits to AWS a good way to donate?