The same way that it helps prevent them in a corporate environment. I work for a security company and control over ingress and egress is absolutely a fundamenta

The same way that it helps prevent them in a corporate environment. I work for a security company and control over ingress and egress is absolutely a fundamental part of our network security. Same as having a centralised firewall on a corporate ISP, having a firewall on a country level can prevent / monitor traffic to whole segments of IT infrastructure.