We used to call this parenting. Censoring the internet at large because some people don't actively police their children's access is not a solution.

My parents made the active parenting decision to expose us to things and stress the value of information. We never had our media/internet consumption censored (hell, I remember sitting on my dad's lap and playing a DOOM mod where we shot Barney and yet it was the Grue from Zork who terrified me), but we were also taught the difference between real life and fiction, that it was okay to not like or feel comfortable with things and stop playing/reading/watching them, and to never uncritically believe anybody.

Whatever you think of my upbringing, it was a choice my parents made because they thought it was best. Plus different children can handle different things. It's very Harrison Bergeronesque to censor everyone for the sake of the few.

I'm also not a big fan of censorship, but this is a big problem we should not just ignore. The best way I think would be if it became a norm that children simply don't get to spend their time on screens. Kind of like it's a norm (also law, but mostly norm) that kids don't get to drink alcohol and smoke.

If there is enough political will and enough people that want to support KF garbage, there are other providers out there, or they can build one.