This was proven to be false on the WAN show. Only 20% of transactions were low confidence and handled by mechanical turk.
20% is an incredibly high number though, if a store has 400 people/hour that means you're manually reviewing 80 transactions per hour, over one transaction per minute. That's multiple human employees.
Proven "false." I've noticed that if one admits the truth with a dismissive or offended tone, you can just continue to claim the lie and through sheer force of will people will still go with it.
I think people just think that they must be misunderstanding something; that nobody could claim one thing while offering evidence of its opposite. 1/5 of purchases lose their significance.
20% seems like a "significant portion" to me