Created a quick Python script to convert nginx blacklist to iptables entries.
You can find the entries in output.txt

VPN blacklist

https://www.lowendtalk.com/discussion/44388/vpn-ip-blacklist

https://github.com/Zalvie/nginx_block_files

Better to use iptables than nginx, so it doesn't waste processor cycles.

https://serverfault.com/questions/432716/where-to-place-nginx-ip-blacklist-config-file

https://www.cyberciti.biz/faq/how-do-i-block-an-ip-on-my-linux-server