The government wants to monitor everything people do online and VPNs give people a way to opt out of that surveillance. It is a typical legislative move to add extra provisions all in the name of “banning the evil, Chinese spy app”. There is no reason to believe this will stop at TikTok. What if people use VPNs to get around other censorship that may or may not exist now? What if people use VPNs to access content using BitTorrent? Who is to say they won’t crack down on that that stuff next?
Governments love to take advantage of situations to expand their control think about what happened after 9/11.
Apparently this is exactly what is going on here: https://twitter.com/Fynnderella1/status/1640016692305711105