I've always found it odd that basic arbitrage (ex: buy asset A on some exchange and sell it immediately on a different exchange and earn the delta as profit) an

I've always found it odd that basic arbitrage (ex: buy asset A on some exchange and sell it immediately on a different exchange and earn the delta as profit) and sandwich attacks (place a buy order before a whale places a big order and place a sell order immediately afterwards) were under the umbrella of MEV. These are trades that are possible in tradfi too. I suppose it's possible that arb trades and sandwich attacks are more of a concern here where miners can insert their own transactions into the mempool but I don't know if we actually see miners engaging in this behavior.