The func_escapezone was used in escape missions (es maps) which don't exist anymore. Half of the terrorist team had to make it to a escapezone to win the round.
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What am I doing these days? Well, I run my own Rust server. It's heavily modded. If you'd like to join, the ip is 167.114.101.67:28116
I also created a website called Rust Tools. It will calculate and tell you the raw amounts of resources needed to craft items.