I think Sparrow used to get money from mixing, but they removed that future. Still, I think that was more of an add-on; really, the motivation was as you describe.
I don't believe they did, actually. Per my understanding, the Whirlpool feature in Sparrow was just an implementation of the open protocol, simply allowing you to join the Samourai mixing network without using Samourai software.
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They had a rev share
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source?
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