The federal government has many tools by which they could accomplish this ban. The Committee on Foreign Investment in the United States has a long, successful history of forcing divestiture by foreign owners of domestic assets.
Additionally, app stores and ISPs are a pretty obvious route for blocking 99% of U.S. users from circumventing the ban. Any users who are able to circumvent those measures will be using an app whose network effect has been destroyed.
Additionally, app stores and ISPs are a pretty obvious route for blocking 99% of U.S. users from circumventing the ban. Any users who are able to circumvent those measures will be using an app whose network effect has been destroyed.