Chad Spangler filming a video. Courtesy: Chad Spangler As TikTok CEO Shou Zi Chew faced hours of grueling questioning from members of Congress in late March, small business owner Chad Spangler watched in frustration. The bipartisan congressional committee was exploring how TikTok, the massively popular short-form video app owned by China's ByteDance, could pose a potential privacy and security threat to U.S. consumers. Representatives grilled Chew about the app's addictive features, possibly dangerous posts and whether U.S. user data could end up in the hands of the Chinese government. Politicians have been threatening a nationwide TikTok ban unless ByteDance sells…