Problem with unban appeals is that probably 75% of the people lie about them using something (in case of hacking) or they bypassed their ban one or multiple times, we cannot be more lax if people lie or bypass.

Another problem is that a lot of people have grown up or started playing other games. Also, games like Fortnite have been growing massively in popularity among the young players which also impacted GunZ popularity. (since it had many young players as well, especially in certain countries)