The threat of public wifi isn’t as big of a deal as it used to be. Before widespread VPNs and when internet traffic was unencrypted, anything you transmitted could be read by someone else on the network. But nowadays all an eavesdropper would see is what websites you’re connecting to (without a VPN) or the VPN if you are using one. Happy to be corrected if I’m mistaken though

TikTok’s whole purpose is mass data-harvesting of its users. An app designed to do that while being owned by foreign nation is a valid concern to point out. Of course, the US doesn’t actually care about anyone’s privacy, they just want the data for themselves. Hence wanting a sale to a US company rather than going after the actual data collection