What are you talking about when you say "when you buy Wi-Fi"? If you walk into a coffee shop, or a hotel, or just about anywhere, you get Wi-Fi for free. Are you talking about buying mobile service from an operator?
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Buying internet access from an ISP or a mobile carrier?
Both require being an adult.
And, "free wifi", like you're talking about, already blocks porn. So problem solved, right?
What's actually the issue here? Because nobody seems to be able to articulate it. What problem are we solving?