> An adult had to pay for the ISP connection
In many countries, it is still possible to buy a prepaid SIM without any ID.
Fewer and fewer countries. I think none of the countries I've been too where I've purchased a SIM without ID allow that anymore. It is required to try to limit purchase by scam call centers and to enable phone number portability.
And if such a country wants to keep kids off of the unrestricted internet they should just ban that practice.
So, they can change that if they want.