This often disregards the cost of retrieving said data, which is at $90/TB for outboud network traffic on top of the costs of making the backups available.
I’m very happy to pay USD 200 if I ever need to retrieve a last chance backup. If I just want the data in no rush I can trickle it back over 20 months for free.
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.