Exploit? No one's forcing people to solve captchas, they do it because it's a good deal for them. I'm from a country that was relatively quite poor just 15-20 years ago, and I can say stuff opportunities like were positive, not exploitative.
From https://dictionary.cambridge.org/dictionary/english/exploita...
exploitation noun [U] (UNFAIR TREATMENT)
the act of using someone or something unfairly for your own advantage:
exploitation of Marx wrote about the exploitation of the workers.
We want to put a stop to the exploitation of children by adults.
The exploitation of fear is an effective means of manipulation.
These people are the victims of reality TV exploitation.