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Many businesses have TB of data they upload and keep for several years, looking at it once or twice over that time if ever. For these you could provision monthly bandwidth as low as 1/30th of the total storage.

It says right there in the article that bandwidth is charged for separately. So you just buy a line of appropriate size, based on actual usage measurements. And each one of these rigs only needs a gigabit connection to upload/download its full capacity each month, which means the network equipment costs can be minimal.

have you ever heard of backups and archiving? ;) there are lots of scenarios when you'd want to write some amount, but not read it back for a while, if ever...