$0.03 per email seems awfully low, and if you do 1 article per minute, you're making $2 an hour, which is definitely not cool.
But how long does it actually take to find one email from an article? Maybe 10-15 seconds? Then you're talking about $7-$10 per hour, which for unskilled work doesn't feel especially exploitative.
The real draw of systems like mechanical turk is not that labor is cheaper (it usually isn't), but that's it's more flexible, i.e. you don't have to hire and train people for any particular task.
But how long does it actually take to find one email from an article? Maybe 10-15 seconds? Then you're talking about $7-$10 per hour, which for unskilled work doesn't feel especially exploitative.
The real draw of systems like mechanical turk is not that labor is cheaper (it usually isn't), but that's it's more flexible, i.e. you don't have to hire and train people for any particular task.