The impact is as follows

Although eBay's return policy may bring some inconvenience and cost to sellers, it also brings some positive effects.

First, this policy enhances buyers' trust and attracts more buyers to choose to shop on eBay, thereby increasing the store's exposure and sales opportunities.

Second, the return policy provides a positive trading environment, making buyers more willing to buy goods from unknown brands or sellers.

Finally, the return policy can also encourage sellers to improve product quality and service levels to avoid returns.