An abrupt decision by American artificial intelligence firm Anthropic to restrict service to Chinese-owned entities anywhere in the world has cast uncertainty over some Claude-dependent overseas tools backed by China’s tech giants. After Anthropic’s notice on Friday that it would upgrade access restrictions to entities “more than 50 per cent owned … by companies headquartered in unsupported regions” such as China, regardless of where they are, Chinese users have fretted over whether they could...