Check the kind of transaction arbitrage bots do
https://etherscan.io/tx/0xf6f3a3978e9edc386e0ec34bacc328db934efef6c8e27ab76f87672d7349c598

This transaction generated 332$ and spent 262$ to do so with an gas fee of 298gwei...

So for this guy to generate thousands of $ per day, he increases the gas fee of everyone to astronomical amount :-/
It's not the miner who fucks up the market, it's the arbitrage traders