There could be issues of informed consent in some cases, because workers may not be aware of the health risks posed by particular sweatshop work. Some sweatshops may use forced labour.
In both cases, workers may not have come to a well-informed judgement that it’s the best among available options, or they may come to decide against it but can’t leave (because of forced labour).
I don’t know how common these are or how much they figure into the popular opposition to sweatshops, though. I think it’s more the impression of exploitation and generally harsh working conditions, especially with child labour, even if workers take the work on voluntarily for good reason.
There could be issues of informed consent in some cases, because workers may not be aware of the health risks posed by particular sweatshop work. Some sweatshops may use forced labour. In both cases, workers may not have come to a well-informed judgement that it’s the best among available options, or they may come to decide against it but can’t leave (because of forced labour).
I don’t know how common these are or how much they figure into the popular opposition to sweatshops, though. I think it’s more the impression of exploitation and generally harsh working conditions, especially with child labour, even if workers take the work on voluntarily for good reason.