You have no chaos because everyone uses USBC rules to govern play.
Un-sanctioned leagues could come up with any rule they wanted. No fouls, 8+ pins count as strikes, etc.
What would ball companies do without certification? Pin manufactures?
Houses already cheat on lane patterns, what about pulling in the kick boards? Raising the gutters?
Without some santioning governing body everything is fair game. It is bad enough as it is and the BPAA is taking over.