[tomooot]

They actually cover these concerns, acknowledge it was a problem with examples of siblings or students behind a shared IP, and then developed a parallel cookie based tracking system, using the "server welcome message" which is served as a web page in the in-game browser.

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.