If they actually wanted to protect children, the answer is simple: reverse the responsibilities. Require porn sites to include metadata indicating it isn’t safe for minors. Require browsers to recognize that metadata, and filter out that content if parental controls are enabled. If parents are still too lazy to turn it on, make it default (like “safe search”, but more effective). The fact none of them have even suggested this is proof they don’t care about children or even porn, they just want to be seen as if they do.