A feature that simultaneously discourages sales, encourages retailers to pull products from the platform, and heavily incentivizes abuse from competitors who would benefit from convincing customers to boycott their competitors products? For some reason I don’t imagine Amazon product managers are going to like this idea.
Boycotts are wishful thinking in the modern era of online shopping. The Venn diagram of people who would actively boycott a product like this and the people who would seek it out on Amazon has no overlap. These products are targeted at people who do purchasing for their office or who click the buy button without taking 1 minute to glance at reviews. The people who care enough to actively boycott have already read reviews of a product before they seek it out for purchase.