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Other instances can ban users; or even defederate with other instances based on their own discretion. This affects how these users can interact with their instance and only it.
A moderator on dubvee did ban your account from participating in any of the communities inside the instance named dubvee.
You can disable your router’s wireless networking (or hide its SSID if you want to use wireless networking). It won’t be an issue if you use either way. Since your dorm told you that you could use a router; these terms wont matter.