Due to all of them having an estimated 0.018% in slavery, which seems kind of arbitrary so they should really mark that as some sort of minimal slavery standard rather than make it look like an estimate actually based on the country.

Site seems pretty good overall but is missing a hard facts and figures section to go alongside the nice graphical interface. They appear to offer a pdf report but they wanted me to request access to get it.

> Due to all of them having an estimated 0.018% in slavery

So they didn't count prisoner labour?

If it's forced labour, it should count. If it's voluntary (to allow inmates to make some money and have something to do), then it shouldn't.

Prison itself isn't voluntary, so it's a biased choice.

True, but whether inmates are forced to provide cheap labor still makes a lot of difference. After the abolition of slavery in the US, prison labor has been used as a replacement in areas that used to rely on slave labor.

> whether inmates are forced to provide cheap labor still makes a lot of difference

What is 'force' though? "Do this or I hit you with a stick"? "Do this and you go back to your cage"? "Do this or there will be nothing positive in your life"?

The prison gets cheap labour. Slavery is just a border on a map of human exploitation, I think some distinctions need far more qualification to be relevant.