SYDNEY—Australia’s antitrust regulator called for measures to curb the influence of Facebook Inc. and Alphabet Inc.’s Google in news and advertising and warned that a tech-sector watchdog may be needed to prevent abuses of power.
The Australian Competition and Consumer Commission, delivering its report at the end of a yearlong inquiry into digital media, proposed changes to merger laws to protect smaller tech firms and said major companies should offer more search and browsing choices for consumers. That could have implications...