If it's a state actor, it's not unreasonable to think they'd spin up their own VPN
All you need a Raspberry Pi and some public Wi-Fi network to create a jump point and hide among the 100s of devices going on and off that one public IP. With projects like TailScale you could set it up and plant it somewhere in a matter of hours
If it is a state actor like China or North Korea, they own the gateways and firewalls and can ensure any traffic they do not want to be identified ever will be.
All you need a Raspberry Pi and some public Wi-Fi network to create a jump point and hide among the 100s of devices going on and off that one public IP. With projects like TailScale you could set it up and plant it somewhere in a matter of hours