If you're a kid and your parent don't give a damn and set you free on the internet you will be exposed to porn.
Why talk to your kids and educate them + maybe do your best to limit their exposure to things you don't agree with when you can clutch your pearls and demand ridiculous things like this?
This will definetly backfire. It's a sad state of afair that reminds me about some dumbass local politicians somewhere that tried to make pi equal 4 since using 3.14 was too hard.
Filter in the browser, at the ISP supplied router, using DNS ... None of it is perfect but also it doesn't require the privacy problems that this does.
Also I have a feeling (although it is just that) that kids aren't getting their porn via google searches. My guess would be social media/chat apps all the time.