It's one thing if you have a source of revenue so justify your S3 costs. My interpretation of the parent commentator's concern is that this person has opened up

It's one thing if you have a source of revenue so justify your S3 costs. My interpretation of the parent commentator's concern is that this person has opened up a multi gigabyte S3 file publicly and sent lots of traffic its way (via hacker news) for what appears to be a passion project.