Can you still make money if the coordinator doesn't take any fees?
YES! With WabiSabi coinjoins, most transactions don’t generate change, but small leftover sats for some users that are uneconomical to return can add up. When they’re enough to pay for a new output, that output can be taken by the coordinator (or "donated" to miner).
How much can that be? It varies based on network fees and the number of participants in each round. For some, it’s a nice passive income. But for some people in countries like India, Nigeria, or the Philippines, it can be a lot!