"Presumably it also does it for free?"
Yes, it is free.
"Frankly, sadly, changing a home router's DHCP server to hand out a different DNS server address is going to be well beyond what most parents are capable of."
If you've not got the technical smarts to put it in place yourself then you're not going to be 'censored' involuntarily are you. Censoring is a strong word and this is most certainly not what Cloudflare are doing.
"I suspect a significant chunk of parents have no idea how to go about restricting what their kids can access."
I suspect a significant chunk of parents don't care what their kids access and never will. There's plenty of advice and ways to filter the Internet for kids if you are so inclined to do so and they're not particularly technical. Companies have made it their business to provide specifically this for decades now. In this article we are talking about DNS filtering which can be done at the OS level if needs be which can be done following a step by step guide. I suspect most people will choose an easier software route if they're not capable.
Biting the hand that feeds IT
