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I was watching @moneyball's talk at bitcoin++ (05:25:04) and he talks about this a little (apparently it only recently became public knowledge).
When I inquired, it's not a technology limitation but actually an intentional policy decision by their NC...uh...I can't steelman the argument. They feel like it's disingenuous to users to not publish it because of the risk of a Spark Operator potentially publishing it
Also, I did a quick scan of @BTCsessions recent WoS tutorial and he doesn't mention this privacy trade-off.
Seems like Spark maybe might have wanted to make this design decision a little more clear to users.