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If a community wants to support a new chain, developers can write a "connector" that connects them to the YAR protocol. Once the code is submitted, it's tested and reviewed by the main development team. If accepted, it's added to the main protocol that all nodes work with - the main binary.
Whenever nodes are taken off the network, they update their software. When 55% of nodes use a new port and observe a new network, it's added to the available sources.
To delist, nodes remove the connector from a supported list. When 55% no longer observe/listen to the Connector, it's removed. The process starts and the assets of this chain are returned to their owners.