Employers are not always very smart. It took humanity half a millennium to realise slavery is inefficient and ditch it. Go figure.
And 68% of American adults don't even know it [0]. Not to mention all the foreign slavery in the supply chain, or all the slavery we've directly enabled by 'toppling dictators' who wouldn't give us their shit.
0 - https://www.merkley.senate.gov/is-slavery-still-legal-in-the...