Community Nodes are servers not hosted by Safing, but by the Portmaster and SPN community. Except for one aspect, community nodes are treated exactly the same as nodes operated by Safing.
The only difference is, that network connections that are not encrypted by themselves, like plain HTTP, will never exit the network at community nodes. Instead, they exit the network at specially trusted servers, which are a subset of the servers operated by Safing.
Community nodes will therefore never see any connection contents, as the connections are always encrypted for the destination server. This makes community nodes safe to use. Not only are they safe to use, but they are recommended, as they provide even better privacy due to more diverse server ownership in the nodes you use.