Japanese technology giant SoftBank Group Corp. is launching a service using OpenAI technology to protect against the looming threat of cyberattacks. Chief Executive Masayoshi Son called Japan’s vulnerability to cyberattacks “a crisis,” comparing it to a potential assault by machine guns instead of the rifle shots of the past. SoftBank will offer “a patching service,” targeting the nation’s top 3,000 companies, behind crucial infrastructure like airports, power systems and transportation. Sam Altman of OpenAI was scheduled to be there Tuesday, but appeared only in a short video. SoftBank and OpenAI set up a 50:50 joint venture last year to develop and exclusively market an AI service for the Japanese market.