I think it's really important to protect children from this type of content. I'm not necessarily against these kinds of blocks but I don't think they'll be effective because there will always be extremely easy ways to bypass them (use a VPN, find a website that isn't beholden to US laws, etc etc etc).

IMO the best approach is to ensure parents are technically competent and knowledgeable enough to be able to configure effective parental controls on all of their children's devices that are difficult to circumvent. E.g. iOS already has iCloud Lock which has proven to be difficult to bypass even with bootROM exploits and jailbreaks. Perhaps they should expand this level of protection to parental controls (if it isn't already).