I don’t use them but It’s because people are using them to evade capital gains taxes. That’s why they have a market demand.
Discussion
I use them for privacy reasons. That also has market demand
I use them because I am fiat broke.
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That explains it. In any case they (and their supporters) should be more upfront about it, and not claim they charge no fees. Charge fees, be clear about the fees you're charging.