DO you even know how this works? Seems like the lot of peeps here have no friggin clue.
1. People build websites and have fiverr people write reviews then link to Amazon to reap that sweet, sweet affiliate cash.
2. People build websites and write reviews for products based on the most return using Amazon Affiliate software that ranks products.
3. People honestly link to their affiliate via a blog for a personal hobby.
Most of the affiliates are trying to make money and they don't give a shit how they do it.
Read this shit... https://www.blackhatworld.com/forums/making-money.12/