I would point out all sites but one: Gamefront. Why? Because they banned a lot of countries, from where good chunk of players and modders are. When I want to download mod for a game, I can't do that, because I am redirected there - thus I can't download it since Polish IPs are just banned.
"Your country is not supported," said Gamefront. Bull****. It's a BAN on IP numbers from my country, nothing more nothing less. It's just racist.
