It is possible that some random no brainers earn some easy money at some time.
It is not possible that every no brainer earns easy money forever. Because there are unavoidable costs to build and run a system. Someone has to pay.
You utterly fail to see how arbitrage really works. And/or the purpose for the arbitrage.
...Market forces that power arbitrage are unstoppable.
So long as there is a price differential outside the system vs inside, and there is a free-flowing pipe between them, it is impossible to stop them from coming to equilibrium. IE: Siphoning volume from CEX, into DEX.
There is an inherent demand for DEX.
That creates the differential over CEX.
The problem is not demand.
The problem is there are no pipes to service that demand.
Make the pipes between CEX and DEX. Make them cheap enough for arbitrage....
...With every $1 captured from CEX, DEX utility grows. Increased DEX utility begets increased DEX demand...
That starts the feed-forward loop that finally supplants CEX.
(The same way Bitfinex supplanted Gox... by exploiting their order book in a pass-thru order book, then incentivising their own order book.)
And that is the purpose for arbitrage... bootstrap volume to supplant CEX... making CEX unnecessary.
You've made a system almost good enough.
You haven't made a system good enough.
All the reward is found in finishing.
None of the reward is found in building.
Bitshares dies without the cheap pipe to service arbitrage between CEX and DEX.
All that building is for nothing.
Or...
You could finish... and create an actual viable DEX solution.