What is the critical distinction between the Early Reviewer Program and the Vine program on Amazon.co.jp?

The critical distinction between the Early Reviewer Program and the Vine program on Amazon.co.jp lies in who writes the reviews and how they are incentivized. The Early Reviewer Program targets customers who have already purchased a product and encourages them to leave a review by offering a small reward, typically a small Amazon gift card. This program is designed to generate reviews for products that have few or no reviews, helping to build social proof and increase customer confidence. On the other hand, the Vine program involves Amazon inviting a select group of trusted reviewers, known as Vine Voices, to review products that are submitted by participating vendors. These Vine Voices are chosen for their expertise and ability to provide detailed and unbiased reviews. Participating vendors pay a fee to have their products reviewed by Vine Voices, and the reviewers receive the products for free. The key difference is that the Early Reviewer Program targets past purchasers, while the Vine program utilizes a curated group of experienced reviewers. The Vine program is generally seen as providing more in-depth and professional reviews, while the Early Reviewer Program focuses on generating a larger volume of reviews from a broader customer base. Only brand registered sellers are eligible for vine.