People review bomb competitors, so you buy a product from a competitor and rate it a zero, say it burst into fire etc (was popular when battery fires were in th

People review bomb competitors, so you buy a product from a competitor and rate it a zero, say it burst into fire etc (was popular when battery fires were in the news). The popularity spiking is to get folks higher up on charts etc. Away from the top few it's pretty easy to get up (for a few days).