It is expensive and bad PR to enforce all the rules
Does the police ticket every single speeder?
Does the attorney general prosecute every single marriage infidelity?
Does Microsoft try to catch every single pirate?
If you want to prosecute every single human's infraction (be in CoC or in music CD), man, your life will not be a happy one.
The rules (or laws) are there to prosecute the WORST offenders. In the for-profit business, the rules will enforced when the offenders might influence the bottom line (aka profit) and the cost of prosecuting it is LESS than the cost of the offense. Bad PR is a cost for them, btw.
Peace, relax, enjoy the game .........