The issue in the US is harm has to be done first and the compensation is based on the harm done.
You are only harmed when amazon loses rights to media you purchased and that harm is easily measured in terms of the monetary value of the thing they took from you (which, they'll likely refund if you start talking to lawyers because it's not worth it to them.)
What we need is to get corporations out of politics.
I don't read anywhere in here where an unaffected individual can raise a case and collect money. Rather, this sets up how the government can enforce the law at various levels. That's pretty standard stuff everywhere (that's why every state has a department of justice). The government can police, but me, and average citizen, can't raise a case against amazon.
Class action lawsuits are civil lawsuits. You can't raise a civil lawsuit if you aren't harmed.
But seems strange that it is legal.