Market failure! Market failure is the term you're looking for.

Also see: childcare, healthcare, many forms of public transport and social infrastructure. Some things markets simply cannot deliver well, and that's okay.

Daycare is the most easily reachable example because it's quite simple compared to the others. Daycare workers are simultaneously some of the lowest paid workers in the US, yet daycare costs are famously high and prohibitive, yet childcare centres are very far from money-printing machines. Margins in the daycare sector are most commonly < 1%.