Why iran has been forbidden?
Website blocks me, and also Linux desktop can not login and link to my v2 account.
This is caused by Google's servers and there isn't much that can be done about it for now. For the website you can simply use a VPN and for the game you can update to the latest version which circumvents issues like this by using regional AWS servers instead of the Google server.
Is the game itself still functional? The most recent versions of the game (1.7.48+) should only need to talk to Amazon AWS servers which I believe are accessible from Iran (correct me if I'm wrong).
The ballistica.net website however is running on Google's servers. If that is the only thing you can't access then I might be able to put together a proxy running on AWS that you can use as a backup option.