Interesting article published by zerohedge on this topic and that you can read here:
https://www.zerohedge.com/news/2021-04-03/ctas-why-it-fell-grace-and-why-they-will-rise-again
CTAS results since QEs started have plummeted, markets are distorted and work in strange ways
Until that year they earned the same in bullish and bearish years …