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342 sats \ 0 replies \ @ama 27 Jan \ on: More Robosats Questions bitcoin_beginners
They take a small fee from both parties on each transaction. Most of the time they don't need to do anything other than maintaining the service up and running. In the rare cases were ther is a dispute, they might need to intervene, but it's usually (in my experience) not a lot of work (time) either.
They are always encrypted. A little more info here.
I think you've already got the rest of your questions answered by others. :-)