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Yes they do, and I think it's because it's an earning model for the service provider, and 2-of-2 feels really scary. But it depends on how trusting you are. If you aren't trusting, 2-of-3 is more scary unless you control the "neutral" share (i.e. it is not neutral)
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What’s the incentive of the sender to release the funds before or after receiving what they are paying for?