Imagine I connect to `example.com`, change my IP address using my VPN service, and then remain on `example.com` in my browser. Meanwhile I open some other sites and eventually switch off my VPN service. Therefore I start using my initial IP again and continue using `example.com`. Can `example.com` detect the change of IP address? Does it matter if I received any activity from `example.com` (incoming message, likes, ...) while I was connected to my VPN?