I would agree when it comes to the most basic real-world skills, but even then you cannot prohibit it. When it comes to digital skills, no, you cannot expect everyone to understand it. Even when it comes to GUI tools. It's just not realistic.
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.