Actually I think KOA is more of a franchise operation. They lease their KOA name and enforce the KOA culture on independent operators. I get the impression that there are roving inspectors that grade the parks on how well they comply with that corporate culture. Failure results in the parks being given the boot.
I was moderately a fan of KOA, not a cheerleader. We would stay at them several times a summer camping season. At least you know that you are getting certain amenities at a KOA. But their huge price increase last year made me write them off our list except as a last resort. At Devils Tower for example ($85/night after the KOA discount).
People griped at me that the parks had the right to set whatever charge that they wanted to. That's true, I am a total believer in Smithian economics. But the buyer has a right to refuse to pay that fee and to vote by finding somewhere else to spend his money. That is what we did.
But I'm glad you found, maybe, the last sensible KOA park.