What does it do?
If you want to start your own bitcoin exchange, is is easier than ever to deploy a robosats coordinator:
https://github.com/RoboSats/robosats-deploy
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More instructions here: https://github.com/RoboSats/robosats/blob/main/setup.md
Discussion
It launches a private exchange where you act as an escrow. Users can connect to you and place offers to buy or sell bitcoin. If there is no dispute, they hit a button that causes your node to automatically release the bitcoin to the btc buyer. If there is a dispute, you can talk to both users via encrypted messages to figure out what happened and release the btc to the aggrieved party.
Currently 4 people are running public coordinators and you can try it yourself here [note that you need a tor-compatible browser like Brave]:
http://robodexarjwtfryec556cjdz3dfa7u47saek6lkftnkgshvgg2kcumqd.onion/
You can also watch a demo here: