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This was actually prompted by a conversation I had with the OpenLedger CEO regarding the exact same thing and how to best explain it to newcomers.

Actually it is even worse with DEX, because if a gateway like OpenLedger is a scam, then users loose trust in both - DEX and gateway. They do not understand that a gateway is a 3rd party exchange. At the same time DEX gateways are "silently" sitting in shadow and doing their business. It is like a Trojan horse.

Which is why educating users to the difference is key.