The act prohibits
> (A) Providing services to distribute, maintain, or update such foreign adversary controlled application (including any source code of such application) by means of a marketplace (including an online mobile application store) through which users within the land or maritime borders of the United States may access, maintain, or update such application.
> (B) Providing internet hosting services to enable the distribution, maintenance, or updating of such foreign adversary controlled application for users within the land or maritime borders of the United States.
With the following relevant definition
> (5) Internet hosting service.—The term “internet hosting service” means a service through which storage and computing resources are provided to an individual or organization for the accommodation and maintenance of 1 or more websites or online services, and which may include file hosting, domain name server hosting, cloud hosting, and virtual private server hosting.
Which I've basically read as "it will be removed from app stores and not be allowed to host content on US servers". Which as a matter of policy seems more than sufficient to reduce the reach of tiktok to a tiny fraction of it's current US user base.