The Google credits are the free credits offered by Google when any new user signs up. The 'redeem' button is just a simple link to the Google signup page https://cloud.google.com/free/

The AWS credits are offered through the AWS Activate program (https://aws.amazon.com/activate/portfolio-package-application/). The benefit description states that "Startups that have previously received $5,000 or more in AWS Credit are ineligible to redeem this offer. Credit is subject to approval."

I'm posting this information as I assume there will be a number of people interested in these perks, and they may not apply to everyone.