Wall of text warning.
I understand that on a surface level, the story they sell you is a good thing. Protecting kids, keeping them off websites they shouldn't be on, stopping predators - I don't think anyone is against all these things. But the fallacy here is that the implementation of all this monitoring means ANYONE could be implicated for ANYTHING the government deems a threat, now or later.
It's akin to installing a camera and microphone in every room of your house that records everything 24/7 and is easily accessible by law enforcement at any time. Not just live feeds, but all the archives going back years as well. And on top of that there are intelligence agencies deploying AI tools to scan all the footage to detect any "problematic" behavior. Even if you're not breaking any laws, they are more than free to flag you for this stuff and start building a profile, false positives included. This is the system they are setting up on the internet.
Let me give you an example: You want to log into Instagram but they require you to do an ID and face scan. So you do it. Now your friend is a bit of an edgy person and sends you a funny meme criticizing Israel. You find it silly, like the post. Instagram recognizes that and serves you some more edgy memes of this nature. Instagram's algorithm is constantly building a profile on you and flags that you like "Israel critic" content. Not illegal. Nothing to hide. Yet. Legislation is later passed that considers even memes of this nature to be racist and antisemitic, punishable by law with fines or worse. Law enforcement queries Meta for a list of all profiles deemed to fall into this category, Meta hands over your real name proven by your "age-verification check". Now you're on an intelligence agency watchlist. They have probable cause to monitor all your online activity and punish you for one misstep. Say the wrong thing, criticize or make fun of the wrong person, look at the wrong website - all fair game to them.
Going back to the cameras in your home, it's like owning a firearm completely legally for years, the AI system flags this to the government. And then firearms are outlawed. You were already flagged so you are now monitored as someone who could pose a risk to the public because you followed all laws in the past.
Stuff like this is already happening around the world. And don't kid yourself by thinking the government doesn't drool over the prospect of implementing the same kind of systems that Iran has where they imprison people for using the internet during a nation-wide shutdown.
Governments want more control, all of them, for all of history.