My knowledge on DEX architecture is limited.
How do you bootstrap a DEX? I guess you need some operators/nodes/whatever they're called to provide service, liquidity, escrow(?). How do Thor, Maya do that? Is the service reliable with acceptable performance? Does the fee income sufficiently offset the operation costs? Honest questions.
With Dash these questions wouldn't come up I think, because the alternative is a PoSe ban. A solid, speedy, incentivized infrastructure is already in place. It just needs to be utilized.
With that said, I'd prefer cooperation instead of rivalry, though. "By virtue of trade a man's wealth is beneficial to all."