This study was limited to the program in Quebec, but this discovery is alarming

> and also that cohorts with increased child care access subsequently had worse health, lower life satisfaction, and higher crime rates later in life.

There are a lot of early childhood studies that can find differences for early school years that later disappear as kids get older. It’s different when the correlations continue to older ages and even start correlating with health outcomes.

There could be some major selection bias effects, but that’s just as true for the positive fiscal outcomes noted in the submitted study.