Neither the title nor the article are painting it as an AWS issue, but as a websocket issue, because the protocol implicitly requires all transferred data to be copied multiple times.
I disagree. Like @turtlebits, I was waiting for the part of the story where websocket connections between their AWS resources somehow got billed at Amazon's internet data egress rates.
If you call out your vendor, the issue usually lies with some specific issue with them or their service. The title obviously states AWS.
If I said that "childbirth cost us 5000 on our <hospital name> bill", you assume the issue is with the hospital.
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I didn't know this - why is this the case?