Wouldn't the US government banning tiktok be unconstitutional?[1] I'm genuinely asking. What kind of forum would tiktok be categorized as?[2] Nonpublic forum?

Wouldn't the US government banning tiktok be unconstitutional?[1] I'm genuinely asking. What kind of forum would tiktok be categorized as?[2] Nonpublic forum? In which case, it's legal for the government to ban it? "in a nonpublic forum, the Government may restrict contents of a speech, as long as the restriction is reasonable and the restriction does not discriminate based on speakers’ viewpoints." [1]https://www.law.cornell.edu/constitution/first_amendment https://www.law.cornell.edu/constitution/first_amendment [2]https://www.law.cornell.edu/wex/forums https://www.law.cornell.edu/wex/forums