For anyone interested in solving this problem in their own business—we take privacy extremely seriously at Scale API (http://www.scaleapi.com) and implement numerous safeguards operationally and technically to ensure this doesn't happen.
I hate that this is going to come off as snark, but a lot of tech startups make claims about executing "rigorous background checks" (Uber et al), which gets proven time and time again is not true at scale.
So what specifically do you do to ensure this? How do I trust your organization?
/s
Seriously though maybe the text wasn't in the image as much as metadata attached to it? Something like the lat/long and time of the image? I don't really know, it's a good question.
What do you mean exactly by "100x better than Mechanical Turk"?