TikTok’s Chinese owner denied on Monday setting up a subsidiary company in Taiwan after the island’s authorities said they were investigating the social media app for running “illegal operations”.The Mainland Affairs Council (MAC), Taiwan’s top China policy-making body, said the cabinet had requested a multi-agency investigation during a meeting on security issues posed by TikTok earlier this month.The case was also forwarded to prosecutors for investigation after a local company allegedly engaged in business activities in Taiwan on behalf of ByteDance, TikTok’s Chinese parent firm, MAC said without elaborating.Taipei has also accused Beijing of stepping up so-called “grey zone” threats, from warplane incursions into its air defence zone to cyberattacks and cognitive warfare.US senators voted unanimously last week to ban the video-sharing app on government phones, part of a growing bipartisan crackdown on TikTok."