In short, while there are trade associations and groups for professional crypto mining operations, miners are independent groups who put up their own money and time to make bitcoin. If people started thinking that miners were self-dealing corruptocrats, the value of bitcoin would immediately plummet. Then the miner’s investment, both the machines and the digital assets accumulated, would be worthless. So, as a miner, you continue being a trustworthy transaction verifier– and, by the way, watching the other miners closely to make sure none of THEM cheat. That’s how the incentives in the bitcoin mining ecosystem make transparency and integrity mutually beneficial.