Customer review collection bias refers to the tendency for online reviews to be skewed towards either positive or negative feedback, due to various factors such as the source of the reviews, the timing of the reviews, and the incentives offered for leaving a review. This bias can impact the overall perception of a product or service, as it may not accurately reflect the experiences of all customers. It is important for consumers to be aware of this bias and to consider a variety of sources when making purchasing decisions based on reviews.