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This is one of the reasons I like SN so much. It's a thing that can't really be achieved with anything else
Agreed. The 'unique use' is a good criterion, I think; but it must be united with actual demand. Actual demand for SN, or Nostr, which can only be realized w/ btc, is low, and shows little sign of growing, as best I can tell.
This doesn't mean it never will. But I sense negligible actual demand for it right now, which is something to consider given the obvious benefits of SN vs any other thing. And yet most people are not hungry for those benefits, and I don't believe anyone will be harangued into it.