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There was a donation of bandwidth for supernode 1, but the cost of that bandwidth is insignificant relative to other costs. The current model is scalable. Supernode 3 is launching in the next week or so and Supernode 4 will be following it soon.

packet.net is main transit provider, and think there are a couple alternatives now as well

It is a hybrid at this point. Supernode and hub connections are not mesh connections, but there is some second hop meshing still happening between nodes where there is not line of sight to a hub.

This isnt much of an issue now that NYC Mesh is providing egress in place of an ISP. There aren't many individuals left broadcasting their own ISP connection out.

It sounds like you were sharing your own ISP connection a while ago before this was the case, mightbyte?