That's awfully fiddly, and probably if amazon detects that bots resume operations after answering a captcha on the same IP it will escalate to banning the IP with HTTP 503 or the like. After all, it is actually fairly trivial to solve captchas programmatically, the problem with doing that is that the next step is getting the IP banned, at least that is how I recall most bot detection algorithms work. A bit of googling suggests that is indeed how they work.
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