If they can identify it, they can throttle or block it.
Not if it's all of AWS using a general egress IP for a given region. They can determine which region it's coming from, but if it was coming from a single VPC with a dedicated IP, they would have likely already dealt with it by now.
It doesn't matter if it's one instance or entire regions - you throttle it. They've identified the traffic by some metric, you use that metric to deal with it as well.
Is it punishing the whole class because of one kid? You bet. Amazon sucks when it comes to dealing with bad behavior from their AWS customers, fuck them.
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