It could be true but FYI if miners were making it even worst but oppose the solution to be implemented to fix this problem. The defi traders are always putting the recommended fees on their tx and they will be doing several tx and that means all of these txs will have used recommended fees and that will make the fees will be growing higher instantly.
Imagine when there are more than 1k people were doing defi transactions at the same time. That's why the ethereum fees is so high now and in addition there are some zero sum tx with high fees to spam the network too.