Today I saw that kind of "sandwich" again on the blockchain transactions. To put it simply, you think you've grabbed a bargain, but in reality, the two slices of bread in the middle are filled with other people's fees... It's funny and frustrating; what makes me angry is that a slight shake of my hand becomes their KPI. Arbitrage is the same; the truly stable ones are often already squeezed into thin margins by bots, leaving the rest for retail investors to see as more like bait. Recently, before and after the upgrade/maintenance of that mainstream public chain, people in the group are guessing whether projects will migrate. I'm actually more worried about liquidity chaos, big slippage, and how much more tempting the "sandwich" becomes (for others). I now prefer to do two fewer trades, place orders more slowly, set stop-losses neatly, at least not become the utensils of a free lunch.