How is this website able to determine my country? [closed]

How is this website able to determine my country? [closed]

Today I wanted to visit https://scp-wiki.wikidot.com/scp-4999 to conduct some scientific research. Upon loading the page, I was greeted with a text saying Russia (the country I'm in) and Belarus are blocked from visiting this website.

This is all cool and completely understandable, but it made me wonder how exactly the website was able to determine my country of origin, since

• I'm using a VPN server in Netherlands (self-hosted, AmneziaWG protocol)
• I'm using a DNS service on that same server
• My "preferred languages" in my browser (which is Firefox) only list English
• Various "ip leak"-type websites correctly place my IP in NL
• No WebRTC leaks detected
• Nothing from DNS servers seems to leak my location
• This persists through private mode
  • as well as multiple cache purges
  • and across other devices
• NoScript changes nothing
• geo.enabled is set to false

Without my fix of SCP, my disappointment is immeasurable and my day is ruined. How does the website do this?