Agreed - it’s not that it’s a bad point but it would be an ineffective rule which is usually an excuse to forgo other more effective (usually more expensive) options

Unfortunately the actual solution will probably have to mirror real world, which means balkanizing the Internet to clarify legal jurisdiction, maybe some international police task force to aid with cross-border investigation, but ultimately it all hinges on whether and how much the countries with most nuclear aircraft carriers are willing to pressure other countries to take this seriously.