TikTok is a threat in many ways:

* The extent to which TikTok tailors content, normalization of over-simplified content, ease of creating content and other factors make it great for radicalization. As well as extremist groups, this applies to more regular protest movements and generally an active citizenry, which is not in the interest of the feds.

* It has encouraged regular crime and idiocy. For example it spread knowledge of the Kia/Hyundai ignition bypass, and is full of pseudomedical nonsence.

It also serves as a useful scapegoat.