You can find literature to support that claim for Youtube, Facebook, and Twitter, not just Tiktok. The Making of a Youtube Radical was a big story back in 2019. Facebook won the election for Trump in 2016. Twitter is owned by a Nazi who routinely boost far-right conspiracy theories.
The answer isn't banning Tiktok but passing strong privacy and data legislation that affects all social media platforms. Not just Tiktok. US social media companies have been pulling on the seams of society far before Tiktok arrived.