SYDNEY, Mar 2 : Australia's internet regulator said it may push search engines and app stores to block artificial intelligence services that fail to verify user ages after a Reuters review found more than half had not made public any steps to comply by a deadline next week. The warning reflects one of the most aggressive efforts globally to rein in AI companies, which face a growing number of lawsuits for failing to stop - and even encouraging - self-harm or violence while researchers caution