Why do I not hear of people capitalizing on stablecoin fluctuations?

With the recent UST/ Luna news, I started looking more into the stability of other stablecoins, and realized that stablecoins like dai and usdt find themselves 3 percent or more off peg often enough for it to seem like an opportunity. Why do I not hear of traders putting buy orders or short orders just a few percent outside the 1.00 mark and waiting for a hit, knowing that 99.9 percent of the time, it returns to normal pricing? Sure, it won’t make you rich, but it sure looks like you could beat the S&P. Is there not enough liquidity during these spikes to make it possible to trade?