Try Quests to earn cryptoPolygon vs Ethereum Fees
This first graph shows the Ethereum fees and the second graph shows the polygon fees. It does look like there is a correlation going into September, because if you add up all the numbers than they are close to the same as the polygon. There are no real divergent, but there are many big differences along the history of the two. Ethereum has more consistency, where as Polygon has skyrocketed recently. Based on my research there has been a lot of people considering Uniswap Polygon to be one of the most likely coins to become stable. It has done very well recently, but is expected to flatline and median out around $35-40 a coin. This would explain why there is a similarity between Ethereum and Polygon because Ethereum is one of the most well known and stable considered coins.