Second this - this needs to be litigated.

How many hours a week would a person need to dedicate to starting a lawsuit about something like this?

Anyone have experience? Even if a law firm would do 100% of the work & charge on contingency, I bet it still takes 100+ hours for the average joe to research and find the firm to do that.

Ask a lawyer friend to refer you. They're pretty good at that. I imagine an initial 1/2 hour conversation will clarify a lot and cost nothing.

If you don't have a lawyer friend, find a friend who does.

The copied brand owner would likely be very interested. That's direct harm to the brand.

Yes, Amazon has what seems to be a paid program for brand owners to monitor and respond to Amazon reviews. It's been around for years now.