My whole point is that "unlawfully high" was totally undefined. The intentions of the law are totally irrelevant here, just how it's being applied. I may not agree that it ultimately helps consumers, but if the EU wants to set rules for pricing, that's totally within their right. Applying rules retroactively is not fair and it creates uncertainty that strongly discourages businesses from rising and operating in Europe.

A law is not fair if there is no way for a reasonable actor to know whether their actions are legal or not. It's especially unfair when something is seemingly fine for 20 years but suddenly becomes not fine and the government wants to confiscate retroactively. This isn't some ongoing wrongdoing that was only recently discovered; MasterCard had this arrangement with probably hundreds of thousands of companies for decades.