Re: 600 bots
More likely it's 'cos 'bots run 24/7.
The headline was rather loose: the quote in the article doesn't imply such a direct relation. But if a human call-centre operator clocks on 8 hours a day, 230 days a year (less time off sick/etc), and takes ten minutes an hour coffee break/loo break, you can see how a bot might do the work of many.