The accept-language header isn't very reliable. For example, I'm not anywhere near the US but my language is set to en-us because that is where I'm from origina

The accept-language header isn't very reliable. For example, I'm not anywhere near the US but my language is set to en-us because that is where I'm from originally (same with the timezone trick). So you end up just identifying immigrants, migrants, and tourists, not necessarily people on a VPN.