An amicus brief filed by NetChoice, a trade group which includes Google, Facebook and Twitter, said a ban could have important implications for the global internet.
“The government’s actions are unprecedented in scope,” the group said in its filing.
A ban would “also create a dangerous precedent” for the open internet, the brief said.
“The prohibition on any use of TikTok code by US developers for any purpose is effectively a ban on the building blocks of digital free expression.”
The trade group said a TikTok ban may be cited by China or other countries “as justification for banning or restricting the activities of US internet businesses, including US-based social media platforms.”