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It's the normal data cost. EG the Landsat data is stored in S3, so it's free to EC2 (in the same region), and somewhere around $0.09/gb to the public internet.

However, the idea is not that you download it all (there's probably cheaper ways to acquire Landsat data), the idea is if you want to do whatever analysis on AWS, they've already got it neatly ingested for you.

You can use Athena, is cheap and easy to use

I guess they want you to run your analyses on AWS directly.

AWS has free tier, in this case 1500 hours free of a DC2.Large on Redshift.