Like, to elaborate — children are still humans, and they still deserve, uh, human rights??
Also, like, the answer to keeping your kid safe on the internet is not insane invasive surveillance that will make them paranoid and secretive and resentful, it's being open and nonjudgmental and accepting with them so they'll want to tell you everything major that happens in their lives themselves, and sitting down and having serious, detailed conversations about how to e.g. spot sexual abuse and grooming. This empowers them.
But see, parental controls aren't actually used to keep kids safe. They're used to censor and control kids worlds, so that parents can use them like little dolls, trying to mold and shape them through the flow of information to create the person they want instead of letting the kid decide who they are based on full information themselves. Parental controls like these are used not to protect kids, but by parents who don't want them finding out gay people exist, or atheists.