I don't know of any arbitrary tasks set up by gatekeepers. I mean, people don't just sit around and think up stupid tasks for fun. These jobs usually arise something like this:
In order to process request X, we need pieces of information A, B, C, D. Users frequently send in incomplete information. So we have to hire someone to check that all the required information is provided and accurate.
Yeah, it's kind of bullshit because it wouldn't be needed if people just did the right thing, but people are people, and they don't. In some cases it can be replaced with a web form with proper validation, but sometimes the information is something you can't verify with Javascript (like checking for a valid driver's license or something), so you need a human. So it goes.
In order to process request X, we need pieces of information A, B, C, D. Users frequently send in incomplete information. So we have to hire someone to check that all the required information is provided and accurate.
Yeah, it's kind of bullshit because it wouldn't be needed if people just did the right thing, but people are people, and they don't. In some cases it can be replaced with a web form with proper validation, but sometimes the information is something you can't verify with Javascript (like checking for a valid driver's license or something), so you need a human. So it goes.