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You don't, so you 2-of-2.
I thought most escrows use 2-of-3 so they can collaborate with the sender or receiver, so you still need to trust they don't collaborate against you
That's the trusted third party setup, but with 2-of-2 you don't need trust, but instead everyone is incentivized to keep their side of the deal.
What’s the incentive of the sender to release the funds before or after receiving what they are paying for?
You overpay into the escrow.
Ah, a bond so I release the funds after receiving what I paid for
I think Robosats is using a bond and 2-of-3 though. If that’s indeed the case, I wonder what their thought process was
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)
how do you trust your escrow guy?