Banning new Steam IDs on banned IPs seems too strict to me. Some ISP use CG-NAT or rotate IPs, meaning a single bad actor could harm many innocent players.
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It's also worth noting this is a 3rd party dedicated server provider, who manages and leases community run game servers. Getting a ban here would prevent you from playing on that provider's servers, but not any of the official matchmaking ones or servers from another hosting provider.