I wasn't arguing against independent shops, im well aware that they are capable of preforming excellent service. But the reputation of the shady mechanic exist

I wasn't arguing against independent shops, im well aware that they are capable of preforming excellent service. But the reputation of the shady mechanic exists for the same reason the reputation of the shady used car dealer exists. Cars are complex, and the average person doesn't have enough time to fully understand them. That is why YourMechanic was able to just raise 24 million in funding (I believe it was that much, I am on my phone right now) there is a huge market of people that don't want to do the research, or put up with the perceived risk of finding an independent mechanic.