That's not accurate. DO's bandwidth is simply cheap, it doesn't matter what tier you go with or how much you use. The $5 plan is merely a convenient illustration, as they embarrass AWS on bandwidth cost across the board. At $0.02 per gb on overages, it's six times cheaper than the 10tb AWS tier.

To match DO with AWS on bandwidth cost, you need to burn a few petabytes.

10tb on AWS? $1,200. Given how cheap bandwidth is these days, that's beyond outrageous. Amazon is charging for bandwidth roughly a hundred times what it costs them.

Now let's say you're actually heavy utilizing DO, so you've got one of their bigger plans and burn up plenty of bandwidth. Their $480 plan comes with 8tb, and the extra 2tb (to match 10tb on AWS), will cost you a mere $40. 16 cores, 48gb of ram, 10tb of bandwidth, for $520.

Of course it's understood people use AWS for reasons other than price.