Court decisions in common law jurisdictions have important and long-lasting effects, not only on the case at hand, but for decades (or centuries) to come on things you wouldn't think can be remotely related to the case.
It's not like that in civil law jurisdictions. Had this case been in France, the decision on credit card would not have created a precedent that Uber and AirBnB and App Store could use to their advantage, because the concept of precedent does not exist in the same manner in France.
And Louisiana and Quebec are not civil law jurisdiction, they are mixed systems because they are still subject to federal laws and supreme courts, so they have civil and common law both.
