The adult entertainment industry cared decades ago [0]. Their solution is simple: sites send the RTA meta tag if applicable, browsers in accounts configured by guardians as "children" look for it. [1]
I think the truth is closer to them being tightly bound to one another over their shared "love" of children. Epstein bouncing around the academic community was the tip of an iceberg. Imagine the reputation laundering that goes on with all of these "for the children" NGOs.
[0] https://en.wikipedia.org/wiki/Association_of_Sites_Advocatin...
[1] https://www.rtalabel.org/