I think arbitrage is a bit misused in this context - it is rather a sort of sniping.
You have a 0.3% fee for swaps happening on Sushiswap. You have to trade MIM to wMemo and then wMemo back to MIM which makes it overall a bit under 0.6% in trading fee. That’s my thesis that specific behavior like the one you state doesn’t exist.
Do you have empirical evidence that there are really big wallets doing that? Or could there be the possibility that many small froggies are behaving like a big whale? You need to consider that also minting causes trading action around rebases.
If you can provide empirical evidence for this sniping I will vote yes but I doubt we will find it.

