If something like this was in widespread use it would have much more impact since countries would see whole swathes of the internet immediately go dark when they make stupid laws.
This is a dangerous precedent though that IMO everyone should fight against.
It's how we get the balkanization of the internet, and the death of it as a global network.
TBH we also shouldn't put the onus on blocking "unsafe" countries on the website owners, nor an intermediary like CloudFlare. If a nation wants to block certain content, let the nation deal with it by getting their own ISPs to block and make sure the citizen's anger gets correctly placed on their government and not the site operators.
But if you're trying to make money through your website... well sorry you're doing business in those countries and I don't have a ton of objection to you needing to follow foreign laws.
I'm fine with "balkanization" (I know some people from the Balkan countries... maybe they'd object to the use of that word) if it means a freedom divide and actual consequences for countries ever eroding freedoms.
Say, I'm the provider... well sorry, you (the customer) are doing business with a foreign country (mine) and you should do it in accordance with YOUR laws about YOUR country's foreign trade.
That's the only way to properly conform to jurisdiction, amirite?
In other words, UK has no jurisdiction over US businesses who conduct business from US soil, UK cannot force them to obey UK law just because a UK citizen decided to buy something over the internet. The UK can punish THEIR citizens for what the UK considers unlawful trades and that's always the case no matter what.
Claiming jurisdiction over foreign businesses ends up in a completely lunatic situation where every business, in every country, has to obey the laws of every other country just because some people might decide to order from abroad. Block, ban, punish only where you have jurisdiction, everything else ends up in sheer insanity.