Are review exchanges a good idea?

No. Like for like reviews break the TOS on Amazon, and often people find it awkward if they receive a good or bad book, and their review is not matching.

It is ethically grey – it’s difficult in some cases to offer an honest review without fear of retaliation.

You can also lose your reviews AND review account, or be banned from the platform entirely. It can also damage your brand and reputation, which in the current hyper competitive climate makes review exchanges worthless against returns.