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I have a new Amazon Linux 2 up and running and it doesn't seem to have any type of firewall running. I also checked the installed packages and while the firewalld.noarch package is available to install it is not installed by default. Maybe your user-init script is installing it, or maybe there is a 3rd party service installing it for you, but I don't think it should be there by default.
Anyway, my personal thoughts are that between NACLs and Security Groups a host based firewall is probably overkill. We don't run any such software on our instances and I don't think I've ever heard a recommendation from AWS that it might be necessary.
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