What kind of content do you serve? 700 RPS is not a big number at all, for sure not enough to qualify as a DoS. I'm not surprised AWS did not take any action.
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I've submitted several complaints to AWS to get this traffic to stop, their typical followup is: We have engaged with our customer, and based on this engagement have determined that the reported activity does not require further action from AWS at this time.
I've tried various 4XX responses to see if the bot will back off, I've tried 30X redirects (which it follows) to no avail.
The traffic is hitting numbers that require me to re-negotiate my contract with CloudFlare and is otherwise a nuisance when reviewing analytics/logs.
I've considered redirecting the entirety of the traffic to aws abuse report page, but at this scall, it's essentially a small DDoS network and sending it anywhere could be considered abuse in itself.
Are there others that have similar experience?