...little incentive...
“The data set creators allow some of these 'contaminants' to remain simply because there is little incentive to spend the resources eradicating them all and they have minimal overall effect on the training of machine learning models.”
In other words they didn't think they would have to do it and now that the data set is created it's really really hard to fix so they don't want to. Nice.
And the "effect on the training of machine learning models" is irrelevant to the privacy concerns.
Biting the hand that feeds IT
