There are a few key things to keep in mind when considering whether or not amazon will do anything about the fake iphone case reviews.
The first is that amazon is a company that is built on customer trust. So, if they were to do anything that would erode that trust - such as taking away reviews or suppressing negative reviews - it would damage their brand and reputation in a very big way.
Second, amazon is a platform that allows for many different types of transactions to take place. So, while they may be able to do something about the fake iphone case reviews, it's not clear that it would be in their best interests to do so.
Third, it's possible that the fake iphone case reviews are not actually violating any of amazon's policies. In which case, amazon would be within their rights to keep them up.
Ultimately, whether or not amazon will do anything about the fake iphone case reviews is uncertain. However, it's important to remember that amazon is a company that values customer trust above all else. So, if they were to take any action that would damage that trust, it would be a very big deal.