A decent filter on a network (think pi-hole and next dns and the like) helps block adverts, trackers, scam sites, shady pop ups as well as bog standard porn sites etc

Internet is full of things that it’s easy to accidentally stumble on that you wouldn’t want a young kid to see and I think it’s a reasonable step to have some basic levels of controls on your own network

The onus is on the parents to manage internet access in a way the feel best and shouldn’t be forced or assumed. definitely not to porn sites (or any other site!) to collect entirely unnecessary personal data which would inevitably get leaked.