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New study finds bots and fraud farms responsible for 73% of web traffic
(interestingengineering.com)
This is a most excellent place for technology news and articles.
Because they're used absolutely everywhere, and often back large portions of Internet infrastructure. I'm a backend developer and we have thousands of "bots" running at any given time to keep our systems going. They generate traffic equivalent to thousands of people and are maintained by a 3 person dev team. This is for a relatively small company. When I was at AWS the scale was much more unfathomable.