You probably shouldn’t have kids if you’re not prepared to look after them.
any parents caught providing such things to their children go on a register and have mandatory courses on parenting.
you can provide gimped versions. micro controllers, school laptops that don't go places they shouldn't go, gimmicky age checks on anything they can use outside of adult supervision.
And the example it's I-0, (I-0.z5, Interstatal Zero) both in English and the faithfully Spanish translation done from the Spanish IF community. Both games are nearly 30 years old.
With no smartphones until they hit 14-15 you don't need no stinky 1984 like laws; ISP would just comply with restricted DNS' per device and that's it. Ah, modern wireless networks such as the ones from town halls and the like? These should already have restricted DNS' for porn and the like.
Next, a PC it's a totally different device, you as a parent should be the accountable one and not the goverment. Your kids want to set a Minetest and some private server to play games and chat without groomers stalking them? teach them.
Enforcing computing stuff it's impossible, with libre software anything can be a general purpose computer. A PSP with a bluetooth keyboard, a PocketCHIP, any smartphone, even the mentioned Amiga FPGA computer, where can connect and use far more modern services than anything you would expect in 1994.
For example, I can have my kid do whatever he wants in his room. I know what's in there and while he may have the occasional stupid idea, it's all fundamentally safe.
But even a tablet breaks that barrier. It's entirely safe for him to listen to music and stories and I want him to be able to do that unsupervised. But solid control over content on Spotify isn't a thing. The catalog contains things that I consider not appropriate for him. And they've lately been adding vidoes to the feed and while I know he tries hard to resist, they deliberately push videos further and further up. So we're back to "I can turn on the story for you and you can listen.", which is super stupid and could be much better if I had solid controls that I can trust.
Yes, I know I can talk to him about not watching the videos. How can an 8 year old compete with the combined effort of the Spotify team paid to make him watch videos? That's just not feasible.
If my local park had a series of rotating knives and the council refused to do anything about it, I wouldn't let my kids go down there, supervised or not.
I agree parenting in the digital world is harder. You either learn how to do it to your standard or you don't allow the child to be part of that world if you are incapable or don't want to.