Steam Support :: CS:GO - Play on worldwide servers from China with a worldwide license
Geo-Filter Guide for CS:GO | Netduma
Release] Block Servers
Скачать CS:Go (mm server) Blocker - Геймплей
4 Ways to Block Proxy Websites - wikiHow
GitHub - kuba1909/linux-csgo-server-blocker: a little tool written in Python 3.8 to block specific server regions for cs:go matchmaking (might work for other Valve games as well)