700 million people live on <2.15$/day people [1]. You can solve a lot of captchas in a day, probably not 1000 though. How does this work?
Not sure if the people living for <2.15$/day have access to sufficient network bandwidth or computers/smartphones. Some may not have access to power.
The anti captcha platforms are working exactly the same as the captcha platforms, they just send captcha through users and then acts as a middleman to get a cut.
People are so used to solve captcha now that you can get them to solve captcha for getting access to anything.