Outbound traffic costs always cost the same regardless of your retrieval speed to API. If you only have a couple TBs worth of high-value data, this may be acceptable to you. It's far from being a universal truth though.
100 GiB per month for a decade... how many terabytes of irreplaceable pictures have you got?
But, yeah, making use of a free service loophole, it taking ten months for a terabyte, and presuming you're using zero other Amazon services that count towards your free trial amount, I agree with you it's a stretch. But if you're really cheap or hate Amazon with a passion (but not enough not to host with them) it's not that far fetched.
